ST STM8L-DISCOVERY User manual

September 2010 Doc ID 17693 Rev 1 1/29
UM0970
User Manual
STM8L-DISCOVERY
Introduction
The STM8L-DISCOVERY helps you to discover the STM8L ultralow power features and to
develop and share your applications. It is based on an STM8L152C6T6 and includes an ST-
Link embedded debug tool interface, LCD (24 segments, 4 commons), LEDs and push
buttons.
Figure 1. STM8L-DISCOVERY board
www.st.com
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Contents UM0970
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Contents
1 Quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Development toolchain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Demonstration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Hardware and layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 STM8L152C6T6 microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Embedded ST-Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.1 Using the ST-Link to program/debug the STM8L on board . . . . . . . . . . 12
3.2.2 Using the ST-Link to program/debug an external STM8L application . . 12
3.3 Power supply and power selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.4 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.5 Push buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.6 Built-in IDD measurement circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.6.1 Run mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.6.2 Low power mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.6.3 Low power mode IDD measurement principle . . . . . . . . . . . . . . . . . . . . 15
3.6.4 Ibias current measurement procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.7 Solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.8 LCD (24 segments, 4 commons) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4 Extension connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5 Electrical schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
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UM0970 Quick start
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1 Quick start
The STM8L-DISCOVERY is a low-cost and easy-to-use development kit to quickly evaluate
and start a development with an STM8L ultralow power microcontroller.
Before installing and using the product, please accept the Evaluation Product License
Agreement from www.st.com/stm8l-discovery.
For more information on the STM8L-DISCOVERY and for demonstration software visit
www.st.com/stm8l-discovery.
1.1 Getting started
1. Check jumper positions on the board, JP1 and CN3 ON (Discovery selected).
2. Connect the STM8L-DISCOVERY board to a PC with a USB cable to power the board.
Red LED LD2 (PWR) then lights up.
3. Function 1 is executed and each click on user button B2 changes the executed function
as described in Ta b l e 1 .
To study or modify the DISCOVER project related to this demo, visit www.st.com/stm8l-
discovery and follow the tutorial. Discover the STM8L features, download and execute
programs proposed in the list of projects. This site also contains examples from which you
can develop your own applications.
1.2 System requirements
●Windows PC (2000, XP, Vista)
●A/Mini-B USB cable
Table 1. Functions
Function LED LD3/4 Bars Value displayed
1 Blink STM8L VDD voltage measured
2 Off STM8L consumption measured in Run mode
3 Off STM8L consumption measured in Low power mode, LCD on
4 Off STM8L consumption measured in Low power mode, LCD off
5 Off STM8L consumption measured in Halt mode, LCD off
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Quick start UM0970
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1.3 Development toolchain
●IAR, Embedded Workbench® for STM8
●STMicroelectronics, ST Visual Develop (STVD)
1.4 Demonstration software
Demonstration software is preloaded in the board's Flash memory. This demonstration uses
the built-in IDD measurement feature of the STM8L-DISCOVERY to automatically measure
and display on the LCD the consumption of the MCU in run and low power modes.
The latest versions of this demonstration source code and associated documentation can
be downloaded from www.st.com/stm8l-discovery.
1.5 Order code
To order the STM8L ultralow power Discovery, use the order code STM8L-DISCOVERY.
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UM0970 Features
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2 Features
The STM8L-DISCOVERY offers the following features:
●STM8L152C6T6 microcontroller, 32 KB Flash, 2 KB RAM, 1 KB EEPROM in 48-pin
LQFP
●On-board ST-Link with selection mode switch to use the kit as a stand-alone ST-Link
(with SWIM connector for programming and debugging)
●Two red LEDs; LD1 for USB communication, LD2 for 3.3 V power on
●Designed to be powered by USB or an external supply of 5 V or 3.3 V
●Can supply target application with 5 volts and 3 volts
●Two user LEDs, LD3 and LD4 (green and blue)
●Two push buttons (User and Reset)
●IDD current measurement
●LCD 28-pin DIP (24 segments, 4 commons)
●Extension header for all QFP48 I/Os for quick connection to prototyping board for easy
probing
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Hardware and layout UM0970
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3 Hardware and layout
The STM8L-DISCOVERY is designed around the STM8L152C6T6 microcontroller in a 48-
pin LQFP package.
Figure 2 illustrates the connections between the STM8L152C6T6 and its peripherals (ST-
Link, push button, LED, LCD and connectors).
Figure 3 and Figure 4 help you to locate these features on the STM8L-DISCOVERY.
Figure 2. Hardware block diagram
Blue LED
LD4
B2
USER
I/O
Mini
USB
Green LED
LD3
B1
RST
RESET
I/OI/O
P1 Header
P3Header
P2 Header
SWIM
LCD (24 segments, 4 commons)
IDD
measurement
Embedded
ST-LINK
STM8L152C6T6
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UM0970 Hardware and layout
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Figure 3. Top layout
ST-Link
LCD 24 segments
IDD measurement
STM8L152C6T6
B2
CN2
JP1
LD3 LD4
B1
CN3
IDD module
LD1
LD2
User button
LED blue
Reset button
LED green
SWIM connector
COM
power
SB1,2
X2 crystal
D2 diode
D1 diode
ST-Link/Discovery
selector
+3.3V power supply
input
+5V
power supply
input
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Hardware and layout UM0970
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Figure 4. Bottom layout
P1
P2
SB4,6,8,10
PRG-32
SB3,5,7,9
DEFAULT
SB11,12,14
SB13,15
SB16
SB17
P3
IDD_Measurement
B2-USER
B1-RESET
X3 crystal
connector
connector
connector
JP1
IDD
(RESERVED)
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UM0970 Hardware and layout
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3.1 STM8L152C6T6 microcontroller
This 8-bit ultralow power MCU has 32 KB Flash, 2 KB RAM, 1 KB data EEPROM, RTC,
LCD, timers, USART, I2C, SPI, ADC, DAC and comparators.
Figure 5. STM8L152C6T6 package
This device provides the following benefits:
●Ultralow power proprietary 130 nm technology:
Speed and power consumption independent of MCU power supply, Ultralow leakage
●Ultralow power design (clock gating, low-power Flash with power-off capability):
Reduced overall Run and Wait mode current consumption by turning off clocks of
unused peripherals or Flash
●Sub 1 µA hardware RTC and AWU system unit:
Ultralow power modes for applications requesting regular wake up
●Range of Low power modes (up to 4):
Suitable for many applications from complete switch off to continuous monitoring at
ultralow frequency
●Advanced and flexible clock system (multiple internal and external clock sources):
Switch and adjust frequency and clock sources on the fly depending on application
needs
●Direct memory access on board (4-channel DMA):
Autonomy for peripherals, independent from core; can switch off Flash memory and
CPU (large current consumption contributors) while keeping peripherals active
●Ultralow power and ultrasafe reset system POR/PDR; additional optional activation
BOR:
Integrated safety and security for application
●Ultrafast wakeup from lowest Low power mode (4 µs):
Fast switching from Static and Dynamic power modes
●Analog functional down to 1.8 V, programming down to 1.65 V:
Full functionality over the complete VDD range
For more information see the STM8L152C6T6 datasheet (Doc ID 15962) on the ST website.
The STM8L152C6T6 8-bit microcontroller offers:
2 Kbytes RAM
32 Kbytes of Flash memory
LQFP48 7 x 7 mm
1 Kbytes EEPROM
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Hardware and layout UM0970
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Figure 6. STM8L152C6T6 block diagram
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