Renesas RH850/U2A Y-RH850-U2A-176PIN-PB-T1-V1 User manual

Cover
All information contained in these materials, including products and product specifications,
represents information on the product at the time of publication and is subject to change by
Renesas Electronics Corp. without notice. Please review the latest information published by
Renesas Electronics Corp. through various means, including the Renesas Electronics Corp.
website (https://www.renesas.com)
Y-RH850-U2A-176PIN-PB-T1-V1
RH850/U2A 176pin
User's Manual: Piggyback Board
www.renesas.comwww.renesas.comwww.renesas.com
Rev.1.00 September 28, 2022
User's Manual
32
RH850 Evaluation Platform
The newest version of this document can be obtained from the following web location:
Y-RH850-U2A-176PIN-PB-T1-V1 Documents

Notice
1. Descriptions of circuits, software and other related information in this document are provided only to illustrate the operation of semiconductor products
and application examples. You are fully responsible for the incorporation or any other use of the circuits, software, and information in the design of your
product or system. Renesas Electronics disclaims any and all liability for any losses and damages incurred by you or third parties arising from the use
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General Precautions in the Handling of Microprocessing Unit and Microcontroller Unit Products
The following usage notes are applicable to all Microprocessing unit and Microcontroller unit products from Renesas. For detailed usage
notes on the products covered by this document, refer to the relevant sections of the document as well as any technical updates that
have been issued for the products.
1. Precaution against Electrostatic Discharge (ESD)
A strong electrical field, when exposed to a CMOS device, can cause destruction of the gate oxide and ultimately degrade the device
operation. Steps must be taken to stop the generation of static electricity as much as possible, and quickly dissipate it when it occurs.
Environmental control must be adequate. When it is dry, a humidifier should be used. This is recommended to avoid using insulators
that can easily build up static electricity.
Semiconductor devices must be stored and transported in an anti-static container, static shielding bag or conductive material. All test
and measurement tools including work benches and floors must be grounded. The operator must also be grounded using a wrist strap.
Semiconductor devices must not be touched with bare hands. Similar precautions must be taken for printed circuit boards with mounted
semiconductor devices.
2. Processing at power-on
The state of the product is undefined at the time when power is supplied. The states of internal circuits in the LSI are indeterminate and
the states of register settings and pins are undefined at the time when power is supplied. In a finished product where the reset signal is
applied to the external reset pin, the states of pins are not guaranteed from the time when power is supplied until the reset process is
completed. In a similar way, the states of pins in a product that is reset by an on-chip power-on reset function are not guaranteed from
the time when power is supplied until the power reaches the level at which resetting is specified.
3. Input of signal during power-off state
Do not input signals or an I/O pull-up power supply while the device is powered off. The current injection that results from input of such a
signal or I/O pull-up power supply may cause malfunction and the abnormal current that passes in the device at this time may cause
degradation of internal elements. Follow the guideline for input signal during power-off state as described in your product
documentation.
4. Handling of unused pins
Handle unused pins in accordance with the directions given under handling of unused pins in the manual. The input pins of CMOS
products are generally in the high-impedance state. In operation with an unused pin in the open-circuit state, extra electromagnetic
noise is induced in the vicinity of the LSI, an associated shoot-through current flows internally, and malfunctions occur due to the false
recognition of the pin state as an input signal become possible.
5. Clock signals
After applying a reset, only release the reset line after the operating clock signal becomes stable. When switching the clock signal
during program execution, wait until the target clock signal is stabilized. When the clock signal is generated with an external resonator or
from an external oscillator during a reset, ensure that the reset line is only released after full stabilization of the clock signal. Additionally,
when switching to a clock signal produced with an external resonator or by an external oscillator while program execution is in progress,
wait until the target clock signal is stable.
6. Voltage application waveform at input pin
Waveform distortion due to input noise or a reflected wave may cause malfunction. If the input of the CMOS device stays in the area
between VIL (Max.) and VIH (Min.) due to noise, for example, the device may malfunction. Take care to prevent chattering noise from
entering the device when the input level is fixed, and also in the transition period when the input level passes through the area between
VIL (Max.) and VIH (Min.).
7. Prohibition of access to reserved addresses
Access to reserved addresses is prohibited. The reserved addresses are provided for possible future expansion of functions. Do not
access these addresses as the correct operation of the LSI is not guaranteed.
8. Differences between products
Before changing from one product to another, for example to a product with a different part number, confirm that the change will not lead
to problems.
The characteristics of a microprocessing unit or microcontroller unit products in the same group but having a different part number might
differ in terms of internal memory capacity, layout pattern, and other factors, which can affect the ranges of electrical characteristics,
such as characteristic values, operating margins, immunity to noise, and amount of radiated noise. When changing to a product with a
different part number, implement a system-evaluation test for the given product.

Table of Contents
1. Overview .....................................................................................................................1
1.1 Package Components...........................................................................................................................1
1.2 Supported Main Boards.........................................................................................................................1
1.3 Main Features .......................................................................................................................................1
1.4 Piggyback Board Views.........................................................................................................................2
1.5 Mounting of the Device..........................................................................................................................4
2. Jumpers, Connectors, Switches and LEDs .................................................................5
2.1 Jumper Overview ..................................................................................................................................6
2.2 Connector Overview..............................................................................................................................8
2.3 LED Overview .......................................................................................................................................9
3. Power Supply............................................................................................................10
3.1 Board Power Connection ....................................................................................................................10
3.2 Voltage Distribution .............................................................................................................................11
3.3 Device Core Voltage (VDD) Selection ................................................................................................12
3.4 Current Measurement Bridges............................................................................................................12
3.5 Power Supply LEDs ............................................................................................................................12
4. Clock Supply .............................................................................................................13
4.1 Main Oscillator.....................................................................................................................................13
4.2 Programmable Oscillator.....................................................................................................................13
4.3 X1 and X2 on CN15 ............................................................................................................................14
5. Debug and Flash Programming Interfaces................................................................15
6. Other Circuitry...........................................................................................................16
6.1 Operation Mode Selection...................................................................................................................16
6.2 RESET Switch.....................................................................................................................................18
6.3 Signaling LEDs....................................................................................................................................19
6.4 Pull-Up/Pull-Down Pin Header............................................................................................................20
7. Connectors................................................................................................................21
7.1 Connectors to the Main Board CN1 to CN3........................................................................................21
7.1.1 Main Board Connector CN1.........................................................................................................21
7.1.2 Main Board Connector CN2.........................................................................................................23
7.1.3 Main Board Connector CN3.........................................................................................................25
7.2 Debug Connector CN4........................................................................................................................28
7.3 Pull-Up/Pull-Down Pin Header CN12..................................................................................................28
7.4 Device Ports Connectors CN13 to CN16............................................................................................29
7.4.1 Device Ports Connector CN13.....................................................................................................29
7.4.2 Device Ports Connector CN14.....................................................................................................30
7.4.3 Device Ports Connector CN15.....................................................................................................31
7.4.4 Device Ports Connector CN16.....................................................................................................32

8. Jumper Configuration Examples ...............................................................................33
8.1 Stand-Alone Operation with Power Supply by Debugger...................................................................33
8.2 Configuration Examples ......................................................................................................................34
8.2.1 General Settings ..........................................................................................................................34
8.2.2 Jumper Indicators.........................................................................................................................34
8.2.3 Stand-Alone Operation with Single External Power Supply 3.3 V: Minimum Configuration 1.....35
8.2.4 Stand-Alone Operation with Single External Power Supply 5.0 V: Minimum Configuration 2.....36
8.2.5 Stand-Alone Operation with All External Power Supplies: Maximum Configuration ...................37
8.2.6 Operation on the Main Board: No External Supply......................................................................38
9. Precautions ...............................................................................................................39
9.1 Power-Off Sequence...........................................................................................................................39
9.2 CAN0RX is Shared with FLASH Programmer Signal FLMD1 ............................................................39
10. Mechanical Dimensions.............................................................................................40
11. Schematics................................................................................................................41
11.1 Page 1...................................................................................................................................................1
11.2 Page 2...................................................................................................................................................2
11.3 Page 3...................................................................................................................................................3
11.4 Page 4...................................................................................................................................................4
11.5 Page 5...................................................................................................................................................5

RH850/U2A 176pin
RENESAS MCU
R20UT5182ED0100 Rev.1.00 Page 1 of 56
September 28, 2022
R20UT5182ED0100
Rev.1.00
September 28, 2022
1. Overview
The RH850/U2A 176pin piggyback board is part of the RH850 Evaluation Platform and serves
as a simple and easy to use platform for evaluating the features and performance of Renesas
Electronics' 32-bit RH850/U2A 176pin microcontrollers.
Notes
1. This document describes the functionality of the piggyback board and guides the user through its
operation.
For details regarding the operation of the microcontroller, refer to the device's Hardware User’s Manual.
2. In this document low active signals are marked by an appended ‘Z’ to the pin or signal name. E.g. the
reset pin is named RESETZ.
3. In this document following abbreviations are used:
−H level, L level: high or low signal level of a digital signal, the absolute voltage value depends on the
signal
1.1 Package Components
The Y-RH850-U2A-176PIN-PB-T1-V1 product package consists of the following items. After
you have unpacked the box, check if your Y-RH850-U2A-176PIN-PB-T1-V1 package contains
all of these items.
Table 1.1 Package Components for the Y-RH850-U2A-176PIN-PB-T1-V1
shows the packing components of the Y-RH850-U2A-176PIN-PB-T1-V1 package.
Table 1.1 Package Components for the Y-RH850-U2A-176PIN-PB-T1-V1
Item Description Quantity
D019381 RH850/U2A 176pin piggyback board 1
D019471 Documentation CD 1
D010816-24 China RoHS document 1
D010818-24 WEEE+CE document 1
D019470-24 Product contents list 1
Jumpers (2-way, 0.1”) In the bag 31 (min. quantity)
Red Hirschmann 4 mm power lab
sockets In the bag 1
16MHz Resonator In the bag 1
20MHz Resonator In the bag 1
24MHz Resonator In the bag 1
Note
Please keep the Y-RH850-U2A-176PIN-PB-T1-V1 packing box at hand for later reuse in sending the product for
repairs or for other purposes. Always use the original packing box when transporting the Y-RH850-U2A-176PIN-PB-
T1-V1. If packing of your product is not complete, it may be damaged during transportation.

RH850/U2A 176pin 1. Overview
R20UT5182ED0100 Rev.1.00 Page 1 of 56
September 28, 2022
1.2 Supported Main Boards
This piggyback board can be used as a standalone board, or it can be mated with a main
board. The following main boards are supported:
•Y-RH850-X1X-MB-T1-V1
•Y-RH850-X1X-MB-T2-Vx
•Y-RH850-X2X-MB-T1-V1
1.3 Main Features
•Burn-in socket for mounting of the device
•Several power set-up options
−Combined operation with powering from main board
−Stand-alone operation with single power supply (e.g. 3.3 V or 5.0 V only)
−Stand-alone operation with flexible, individual power supply (typ. 1.12 V, 3.3 V, 5.0 V)
•Debugging and programming interface:
−14-pin LPD/JTAG Debug Connector (e.g. for using E2 OCD Emulator or PG-FP6 Flash
Programmer)
•Pin headers for direct access to each device pin
•Reset switch
•External clock circuit with an exchangeable 16/20/24/40 MHz Crystal Resonator
•General purpose signaling LEDs
•Jumpers for device mode selection and other configuration options
•Operating temperature from 0 °C to +40 °C

RH850/U2A 176pin 1. Overview
R20UT5182ED0100 Rev.1.00 Page 2 of 56
September 28, 2022
1.4 Piggyback Board Views
Following figures provide the top and bottom views of the piggyback board.
Figure
1.2 Piggyback board bottom view
Figure
1.1 Piggyback board top view

RH850/U2A 176pin 1. Overview
R20UT5182ED0100 Rev.1.00 Page 3 of 56
September 28, 2022
Following figures provide the drawing of top and bottom views of the piggyback board.
Barcode
Figure 1.4 PiggyBack Board bottom view
Figure 1.3 PiggyBack Board top view

RH850/U2A 176pin 1. Overview
R20UT5182ED0100 Rev.1.00 Page 4 of 56
September 28, 2022
1.5 Mounting of the Device
The board is designed for use with the following device(s):
•R7F702302FAFK (RH850/U2A6)
The device must be placed inside the socket IC1. To insert the device, align the device pin 1
with the marking of the socket.
Pin 1 of the socket is on the side with the “IC1” label (see also white point in
Figure 1.1
Piggyback board top view
and in Figure 1.5 Yamaichi socket IC572-1764-038N-YD .
CAUTION
Be careful with the device placement in the socket to avoid damage of the device.
Figure
1.5 Yamaichi socket IC572-1764-038N-YD

RH850/U2A 176pin 2. Jumpers, Connectors, Switches and LEDs
R20UT5182ED0100 Rev.1.00 Page 5 of 56
September 28, 2022
2. Jumpers, Connectors, Switches and LEDs
This section provides complete lists of all jumpers, connectors, and LEDs.
The placement of these components on the board is depicted in the figure below.
Figure
2.2 Placement of jumpers, connectors and LEDs on top side
Figure
2.1 Placement of connectors on bottom side
Barcode

RH850/U2A 176pin 2. Jumpers, Connectors, Switches and LEDs
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September 28, 2022
2.1 Jumper Overview
The following table provides an overview of all jumpers.
Table 2.1 Jumper overview (cont'd)
Jumper Function Remark
JP1 Voltage selection for VDDIOF
•JP1[2-1]: 5.0 V
•JP1[2-3]: 3.3 V
refer to 3.2 Voltage Distribution
JP4 Current measurement bridge of 5.0 V power rail refer to 3.4 Current Measurement Bridges
JP5 Current measurement bridge of 3.3 V power rail
JP6 Voltage selection for E0VCC
•JP6[2-1]: 5.0 V
•JP6[2-3]: 3.3 V
refer to 3.2 Voltage Distribution
JP7 Voltage selection for E1VCC
•JP7[2-1]: 5.0 V
•JP7[2-3]: 3.3 V
JP8 Voltage selection for E2VCC
•JP8[2-1]: 5.0 V
•JP8[2-3]: 3.3 V
JP10 Voltage selection for SYSVCC
•JP10[2-1]: 5.0 V
•JP10[2-3]: 3.3 V
JP11 Voltage selection for VCC
•JP11[2-1]: 5.0 V
•JP11[2-3]: 3.3 V
JP12 Voltage selection for SVRDRVCC
•JP12[2-1]: 5.0 V
•JP12[2-3]: 3.3 V
JP13 Voltage selection for SVRAVCC
•JP13[2-1]: 5.0 V
•JP13[2-3]: 3.3 V
JP15 Voltage selection for Pull-up/Pull-down pin header
CN12 pins 11, 13, 15, 17, 19
•JP15[2-1]: 5.0 V
•JP15[2-3]: 3.3 V
refer to 6.4 Pull-Up/Pull-Down Pin Header
JP16 Voltage selection for 1.12 V VDDs
•JP16[2-1]: reg_vcc_VDD
•JP16[2-3]: IN_1v12
refer to 3.3 Device Core Voltage (VDD) Selection
JP23 Voltage selection for VDD
•JP23[2-1]: VDDs
•JP23[2-3]: SVR_OUTPUT
JP25 Voltage selection for Pull-up/Pull-down pin header
CN12 pins 1, 3, 5, 7, 9
•JP25[2-1]: 5.0 V
•JP25[2-3]: 3.3 V
refer to 6.4 Pull-Up/Pull-Down Pin Header

RH850/U2A 176pin 2. Jumpers, Connectors, Switches and LEDs
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September 28, 2022
Table 2.1 Jumper overview (cont'd)
Jumper Function Remark
JP30 Current measurement bridge of 5.0 V A/D
Converter power supply refer to 3.4 Current Measurement Bridges
JP31 Current measurement bridge of 3.3 V A/D
Converter power supply
JP33 Voltage selection for A0VREFH
•JP33[2-1]: 5.0 V
•JP33[2-3]: 3.3 V
refer to 3.2 Voltage Distribution
JP35 Voltage selection for A1VREFH
•JP35[2-1]: 5.0 V
•JP35[2-3]: 3.3 V
JP37 Voltage selection for A2VREFH
•JP37[2-1]: 5.0 V
•JP37[2-3]: 3.3 V
JP38 MODE0 level selection refer to 6.1 Operation Mode Selection
JP39 FLMD1 level selection
JP40 FLMD2 level selection
JP41 FLMD0 level selection

RH850/U2A 176pin 2. Jumpers, Connectors, Switches and LEDs
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September 28, 2022
2.2 Connector Overview
The following table provides an overview of all connectors.
Table 2.2 Connector overview (cont'd)
Connector Function Remark
CN1 Main Board connectors refer to 7.1 Connectors to the Main Board CN1
to CN3
CN2
CN3
CN4 Debug connector refer to 5 Debug and Flash Programming
Interfaces and 7.2 Debug Connector CN4
CN7 Signaling LEDs pin header refer to 6.3 Signaling LEDs
CN8 GND for external power supply refer to 3.1 Board Power Connection,
connector CN11 is not assembled on the board
CN9 +5.0 V external power supply
CN10 +3.3 V external power supply
CN11 +1.12 V external power supply *
CN12 Pull-up/Pull-down pin header refer to 6.4 Pull-Up/Pull-Down Pin Header and 7.3
Pull-Up/Pull-Down Pin Header CN12
CN13 Device ports connectors refer to 7.4 Device Ports Connectors CN13 to
CN16
CN14
CN15
CN16
Note: * Refer to 3.3 Device Core Voltage (VDD) Selection for further details about VDD voltage.

RH850/U2A 176pin 2. Jumpers, Connectors, Switches and LEDs
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2.3 LED Overview
The following table provides an overview of all LED.
Table 2.3 LED overview
LED Function Color Remark
LED1 Device ERROROUT_M
signal red
LED2 Signaling LED yellow connection via CN7,
refer to 6.3 Signaling LEDs
LED3 Signaling LED
LED4 Signaling LED
LED5 Signaling LED
LED6 Signaling LED
LED7 Signaling LED
LED8 Signaling LED
LED9 Signaling LED
LED10 1.12 V device core voltage
VDD green refer to 3.5 Power Supply LEDs
LED11 5.0 V power supply P5V0 green
LED12 3.3 V power supply P3V3 green
LED13 Reset switch SW1 on red
LED14 Device VMONOUT signal red
LED15 Device PWRCTL signal red

RH850/U2A 176pin 3. Power Supply
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September 28, 2022
3. Power Supply
3.1 Board Power Connection
The device and the board require various power supply voltages:
•3.3 V for most of the digital circuitry on the device and on the board
•5 V in case some ports shall be operated with 5 V I/O voltage
•1.12 V for the device's VDD core voltage supply
Refer to 3.3 Device Core Voltage (VDD) Selection for further details about VDD voltage.
Note
Within this document all voltage values are considered as ‘typical’.
Refer to the 'Electrical Characteristics' section of the Hardware User's Manual for allowed voltage ranges.
The following connectors are available to supply external voltages:
•Four 4 mm ‘banana-type’ connectors are used to connect external power supplies:
−black connector CN8 for GND (VSS)
−red connector CN9 for 5 V
−red connector CN10 for 3.3 V
−red connector CN11 for 1.12 V
Refer to
3.3 Device Core Voltage (VDD) Selection for further details about VDD
voltage.
Connector CN11 is not assembled at delivery of the board, but separately supplied with the
board package.
In case the piggyback board is mounted on a Main Board, all voltages except for 1.12 V (VDD)
are supplied by the Main Board.
CAUTION
Do not supply the 5 V (CN9) and 3.3 V (CN10) voltage directly to the piggyback board in case it is
mounted on the Main Board.
Connecting external 1.12 V via CN11 (and GND via CN8) is still an option also in this case.
For some general power supply scenarios, the jumper settings are described in 8 Jumper
Configuration Examples
.

RH850/U2A 176pin 3. Power Supply
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September 28, 2022
3.2 Voltage Distribution
The following table shows the required device power supply pins and their function:
Table 3.1 Device power supply pins (cont'd)
Device power supply pin Voltage Function
E0VCC, E1VCC, E2VCC 3.3 V, 5 V Power supply for I/O ports
SYSVCC 3.3 V, 5 V Power supply for System Logic and internal voltage regulator
power I/O ports
VCC 3.3 V, 5 V Power supply for on-chip flash memory
SVRDRVCC 3.3 V, 5 V Power supply for on-chip Switching Voltage Regulator (SVR)
SVRAVCC 3.3 V, 5 V
VDDIOF 3.3 V, 5 V I/O voltage supply for the Main Board
A0VREFH, A1VREFH, A2VREFH 3.3 V, 5 V A/D Converter's reference voltages
VDD 1.12 V * Core supply voltage
Note: * Refer to 3.3 Device Core Voltage (VDD) Selection for further details about VDD voltage.
Each of the above voltages can be selected from
•5.0 V, 3.3 V (where applicable, see table above)
by a set of jumpers. For details refer to
Figure 3.1 Voltage distribution and Table 2.1 Jumper
overview (cont'd)
Figure 3.1 Voltage distribution
VOLTAGE DISTRIBUTION
P5V0
A0VREFH
VDDs
1.12V
VDD
1.12V
1.12V
1.12V
3.3V or 5V
3.3V or 5V
E1VCC
3.3V or 5V
E0VCC
3.3V or 5V
E2VCC
3.3V or 5V
A2VREFH
3.3V or 5V
5.0V 5.0V
A3V3
3.3V5.0V 3.3V
P3V3 A5V0
A1VREFH
3.3V or 5V
IN_1v12
1.09V
SVR_OUTPUTreg_vcc_VDD
1u
1u
1u
3.3V
3V3
1u
1u
1u
5.0V
5V0P5V0
3.3V
P3V3
3.3V or 5V
SYSVCC
VCC
3.3V or 5V
SVRDRVCC
3.3V or 5V
SVRAVCC
3.3V or 5V
VDDIOF
JP1
JP23JP16
C109
C107
C105
JP37
JP35
JP33
JP31
JP30
JP13
JP12
JP11
JP10
JP8
JP7
JP6
JP5
JP4
C94
C95
C96
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
21
21
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
21
21
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
2
1
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
2
1
2
1

RH850/U2A 176pin 3. Power Supply
R20UT5182ED0100 Rev.1.00 Page 12 of 56
September 28, 2022
3.3 Device Core Voltage (VDD) Selection
The device core voltage VDD (typ.1.12 V) can be
•supplied from external via CN11 (voltage IN_1v12)
•generated from the P3V3 power rail by use of the on-board voltage regulator IC16 (voltage
reg_vcc_VDD)
•generated by the on-chip Switching Voltage Regulator (SVR) in combination with device
external power transistors TR1, TR2 (voltage SVR_OUTPUT)
Note
The IN_1v12 and reg_vcc_VDD voltages have a level of typical 1.12 V, which is higher than the typical
device core voltage VDD of 1.09 V. The 30 mV difference is supposed to compensate voltage drops over the
power rails on the board, in particular over the jumpers.
Selection of the VDD source is achieved by use of the jumpers JP23 and JP16:
•JP23[2-1]: VDD = 1.12 V (VDDs) from
−JP16[2-1]: VDDs = reg_vcc_VDD from on-board voltage regulator IC16
−JP16[2-3]: VDDs = IN_1v12 from external supply CN11
•JP23[2-3]: VDD = 1.09 V (SVR_OUTPUT)
3.4 Current Measurement Bridges
The total current of the 5V0 and 3V3 power rails can be measured by replacing the jumpers
JP4 and JP5 with a current meter.
Accordingly, the total current via the A/D Converter's supply voltages A5V0 and A3V3 can be
measured via the jumpers JP30 and JP31 respectively.
The current of particular power supply pins of the device can be measured via their respective
supply selection jumpers, refer to
Figure 3.1 Voltage distribution .
3.5 Power Supply LEDs
The following green LEDs indicate the presence of various voltages on the piggyback board:
•LED11 for 5.0 V power rail P5V0
•LED12 for 3.3 V power rail P3V3
•LED10 for 1.12 V device core voltage VDD
CORE VOLTAGE SELECTION
VDDs
1.12V
VDD
1.12V
1.12V
1.12V
IN_1v12
1.09V
SVR_OUTPUTreg_vcc_VDD
JP23JP16
3
2
1
3
2
1
3
2
1
3
2
1
Figure
3.2 Device core voltage (VDD) selection

RH850/U2A 176pin 4. Clock Supply
R20UT5182ED0100 Rev.1.00 Page 13 of 56
September 28, 2022
4. Clock Supply
The device's operation clock can be generated by
•the on-chip main oscillator circuit in combination with an off-chip resonator, connected to
the X1, X2 terminals
•an off-chip oscillator, the clock is fed into the X1 terminal
4.1 Main Oscillator
For operating the on-chip main oscillator the piggyback board provides a socket (X1) for a
resonator.
Optionally a resonator (X3) can be soldered on the board, refer to the figure above.
Several resonators for various main oscillator frequencies (16 MHz, 20 MHz, 24 MHz,
40 MHz) are included in the board package.
The 40MHz resonator is by default mounted to X1.
For package content please refer to
1.1 Package Components
CAUTION
Only one oscillator, either X1 or X3, can be used at any one time for the main oscillator.
4.2 Programmable Oscillator
Instead of using the on-chip main oscillator a programmable crystal oscillator (OSC1) circuit
can be soldered on the board.
24 MHz provide additional
20 MHz provide additional
16 MHz provide additional
22p
DNF/DNB
0
DNF/DNB
0
100n
3.3V
P3V3
DNF/DNB
1K0
DNF/DNB
22p
DNF/DNB
SG8018CE-20.000000MHz
40.000 MHz + socket
18pF
0
16MHz
DNF/DNB
rh850_u2a16_176_yam_Socket
8pF
DNF/DNB
IC1
X3
C98 C97
X1
R3
R2
R4
OSC1
C16
R1
X1
X1_C
X2_C
X2
122
124
4
1
2
3
OE
VCCGND
CLK
X2
X1
IN
OUT
CAUTION!
Don’t use crystal and
oscillator IC at the same time
Figure
4.1 Clock supply

RH850/U2A 176pin 4. Clock Supply
R20UT5182ED0100 Rev.1.00 Page 14 of 56
September 28, 2022
The available footprint and circuitry is designed for a SG-8018CE programmable crystal
oscillator from Seiko Epson. The output of this oscillator can be connected to X1 terminal via
resistor R2.
The SG-8018CE is neither mounted on nor provided with the board. For details about the
available circuitry, refer to
Figure 4.1 Clock supply .
CAUTION
A resonator mounted on socket X1 or soldered on X3 must not be used in parallel to another clock
source.
4.3 X1 and X2 on CN15
To minimize disturbance on the resonator signal the device pins X1 and X2 are by default not
connected to a pin header. If needed the pins can be connected to CN15 via 0 Ω resistors:
•X1: Pin 36 (marking: 124) of CN15 to supply an external clock to the device via R3
•X2: Pin 34 (marking: 122) of CN15 for measurement purposes of the clock via R4