NXP Semiconductors freescale TWR-MCF51JG User manual

Freescale Semiconductor Inc. TWRMCF51JGUM
TWR-MCF51JG Tower Module
User's Manual
Rev. 1.1

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Table of Contents
1TWR-MCF51JG and TWR-MCF51JG-KIT Overview.......................................................................4
1.1 Contents..................................................................................................................................................................................5
1.2 Features ..................................................................................................................................................................................5
1.3 Getting Started.....................................................................................................................................................................6
1.4 Reference Documents.......................................................................................................................................................6
2Hardware Description ...........................................................................................................................7
2.1 MCF51JG Microcontroller................................................................................................................................................7
2.2 Clocking ..................................................................................................................................................................................8
2.3 System Power.......................................................................................................................................................................9
2.4 Debug Interface ................................................................................................................................................................13
2.4.1 OSBDM ................................................................................................................................................................................................. 13
2.5 Accelerometer...................................................................................................................................................................13
2.6 Pushbuttons, LEDs ..........................................................................................................................................................14
2.7 General Purpose Tower Plug-in (TWRPI) Socket...............................................................................................14
2.8 USB.........................................................................................................................................................................................15
3Jumper Table.......................................................................................................................................... 16
4Input/Output Connectors and Pin Usage Table......................................................................... 17
5Tower Elevator Connections ............................................................................................................ 19

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List of Figures
Figure 1. Freescale Tower System Overview .............................................................................................. 4
Figure 2. Callouts on front side of the TWR-MCF51JG ............................................................................... 6
Figure 3. TWR-MCF51JG Block Diagram ..................................................................................................... 7
Figure 4. Main Oscillator Input ................................................................................................................... 8
Figure 5. 32 KHz Oscillator Input................................................................................................................. 9
Figure 6. Accelerometer Circuit ................................................................................................................ 13
Figure 7. USB dual-role interface.............................................................................................................. 16
List of Tables
Table 1. J10, Regulator Power Source Selection......................................................................................... 9
Table 2. J9, Board Power Source Selection............................................................................................... 11
Table 3. J12, Board Power Source Selection............................................................................................. 11
Table 4. General Purpose TWRPI socket pinout ....................................................................................... 15
Table 5. TWR-MCF51JG Jumper Table ...................................................................................................... 16
Table 6. I/O Connectors and Pin Usage Table........................................................................................... 17
Table 7. TWR-MCF51JG Primary Connector Pinout.................................................................................. 19
Revision History
Revision
Date
Changes
0
Initial Release for Rev A pre-production module.
1
Oct. 2012
Updates for Rev B module.

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1TWR-MCF51JG and TWR-MCF51JG-KIT Overview
The TWR-MCF51JG is a Tower Controller Module compatible with the Freescale Tower System. It can
function as a stand-alone, low-cost platform for the evaluation of the ColdFire+ MCF51JG
microcontroller (MCU) devices. The TWR-MCF51JG features the MCF51JG, a ColdFire+ 32-bit
microcontroller built on the Version 1 (V1) ColdFire® core and enabled by innovative 90nm thin film
storage (TFS) flash process technology with FlexMemory. The MCF51Jx families offer a rich
combination of additive peripherals including USB, hardware encryption, and more.
The TWR-MCF51JG is available as a stand-alone product or as a kit (TWR-MCF51JG-KIT) with the Tower
Elevator Modules (TWR-ELEV) and the Tower Prototyping Module (TWR-PROTO). The TWR-MCF51JG
can also be combined with other Freescale Tower peripheral modules to create development
platforms for a wide variety of applications. Figure 1 provides an overview of the Freescale Tower
System.
Figure 1. Freescale Tower System Overview

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1.1 Contents
The TWR-MCF51JG contents include:
TWR-MCF51JG board assembly
3ft A to mini-B USB cable for debug interface and power
3ft A to micro-B USB cable for MCF51JG USB interface
Micro-A to A adapter for MCF51JG USB Host applications
Quick Start Guide
The TWR-MCF51JG-KIT contains:
TWR-MCF51JG MCU module
TWR-ELEV –Primary and Secondary Elevator Modules
TWR-PROTO –Prototyping module
1.2 Features
Figure 2 shows the TWR-MCF51JG with some of the key features called out. The following list
summarizes the features of the TWR-MCF51JG Tower MCU Module:
Tower compatible microcontroller module
MCF51JG256: MCF51JG with 256 Kbytes of flash in a 44-pin MAPLGA package
Dual role USB interface with Micro-AB USB connector
General purpose Tower Plug-in (TWRPI) socket
On-board debug circuit (OSBDM) with virtual serial port
Three axis accelerometer (MMA8451Q)
Two (2) user-controllable LEDs
Two (2) user pushbutton switches & One (1) reset pushbutton switch

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Figure 2. Callouts on front side of the TWR-MCF51JG
1.3 Getting Started
Follow the Quick Start Guide found printed in the TWR-MCF51JG box or the interactive DVD for the list
of recommended steps for getting started. Check for new or revised documentation on the tool
support page for the TWR-MCF51JG: http://www.freescale.com/TWR-MCF51JG.
1.4 Reference Documents
The documents listed below should be referenced for more information on the ColdFire+ devices,
Freescale Tower System, and the TWR-MCF51JG Controller Module. These can be found in the
documentation section of freescale.com/TWR-MCF51JG or freescale.com/coldfire+.
TWR-MCF51JG-QSG: Quick Start Guide
TWR-MCF51JG-SCH: Schematics
TWR-MCF51JG-PWA: Design Package
ColdFire+ Portfolio Product Brief
MCF51JG256 Reference Manual
Tower Configuration Tool
Tower Mechanical Drawing
Switches
LEDs
Reset
Power / OSBDM
Mini-B USB
Connector
MCF51JG Micro-
AB USB Connector
General Purpose
TWRPI Socket
Secondary
Connector
Primary Connector
MMA8451Q
Accelerometer
MCF51JG256
Power Select
Jumpers

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2Hardware Description
The TWR-MCF51JG is a Tower Controller Module featuring the MCF51JG256—a ColdFire+ based
microcontroller with USB 2.0 full-speed OTG controllers in a 44 MAPLGA package. It is intended for use
in the Freescale Tower System but can operate stand-alone. An on-board debug circuit, OSBDM,
provides a BDM interface and a power supply input through a single USB mini B connector. Figure 3
shows a block diagram of the TWR-MCF51JG. The following sections describe the hardware in more
detail.
Figure 3. TWR-MCF51JG Block Diagram
2.1 MCF51JG Microcontroller
The TWR-MCF51JG module features the MCF51JG256CFT. The key features of the microcontroller are:
32-bit ColdFire+ core with FlexMemory, EMAC, and DIV hardware acceleration
50 MHz maximum core operating frequency
44-pin MAPLGA, 5mm x 5mm
1.85V –3.6V operating voltage input range
256 Kbytes of program flash, 64 Kbytes of static RAM
FlexMemory consisting of 32 Kbytes of FlexMemory that can be used as additional non-volatile
flash or up to 2KB of enhanced EEPROM.
10 flexible low power modes, ideal for extending battery life
Cryptographic Acceleration Unit (CAU) and Random Number Generator (RNGA) for secure
communications

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Integrated USB 2.0 Full-Speed Device/Host/OTG Controller supporting connection via USB and
battery charging
Serial audio interface (SAI) providing a direct interface to codecs and to Inter-IC Sound (I2S)
audio devices
Real-time debug support, with six hardware breakpoints that can be configured to halt the
processor or generate debug interrupt
Multi-purpose clock generator with PLL and FLL operation modes; multiple input oscillator or
resonator frequency ranges; two internal trimmable references
SPI, I2C, UART (SCI)
GPIO with pin interrupt support, DMA request capability, digital glitch filtering
2.2 Clocking
The ColdFire+ MCUs start up from an internal digitally controlled oscillator (DCO). Software can enable
the main external oscillator (EXTAL/XTAL) if desired. The external oscillator/resonator for the
Multipurpose Clock Generator (MCG) module can range from 32.768 KHz up to a 32 MHz.
The TWR-MCF51JG provides an 8 MHz ceramic resonator as shown in Figure 4 below and sheet 4 of the
schematics. This oscillator can be used as a clock source for the phase locked loop (PLL) inside the
MCG.
Notes
1. When R7 is not populated (default), configure the crystal oscillator for low-power operation
(MCG_C2[HGO] = 0).
2. The resonator used here has internal load capacitors. Therefore no external or internal load
capacitance within the MCU is required.
Figure 4. Main Oscillator Input
Additionally, the TWR-MCF51JG provides a 32.768 KHz oscillator for an accurate real time clock source.

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Figure 5. 32 KHz Oscillator Input
2.3 System Power
When installed into a Tower System, the TWR-MCF51JG can be powered from either an on-board
source or from another source in the assembled Tower System.
In stand-alone operation, the main power source for the TWR-MCF51JG module is derived from the
5.0V input from either the OSBDM USB mini-B connector (J14), the MCF51JG USB micro-AB connector
(J8), or the EzPort header (J16)when a shunt is placed on jumper J15. Two low-dropout regulators
provide 3.3V and 2.0V supplies from the 5.0V input voltage. Additionally, the 3.3V regulator built into
the MCF51JG can be selected. All the user selectable options can be configured using two headers, J9
and J10.
The J10header is used to select the power source that is supplied to one of the three possible voltage
regulators. The J11header is used to select the regulated board power source. Refer to Table 1 and
Table 2 for details.
Table 1. J10, Regulator Power Source Selection
J10 Shunt Setting
Description
1
2
7
8
1-2
Power from the OSBDM interface (J14) supplied to the on-
board voltage regulators. This is a default setting.
1
2
7
8
5-6
Power from the MCF51JG USB device interface (J8) supplied
to the MCF51JG on-chip regulator. This is a default setting.

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1
2
7
8
6-8
Power from the Tower Primary Connector USB device
interface supplied to the MCF51JG on-chip regulator.
1
2
7
8
3-5
2-4
Power from the MCF51JG USB device interface (J8) supplied
to the on-board voltage regulators.