User manual

DocID025091 Rev 1 19/30
UM1656 Hardware and layout
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4.9 Extension connectors
The male headers P1 and P2 can connect the 32L100CDISCOVERY to a standard
prototyping/wrapping board. STM32L100RCT6 GPI/Os are available on these connectors.
P1 and P2 can also be probed by an oscilloscope, logical analyzer or voltmeter.
Table 5. MCU pin description versus board function
MCU pin Board function
Main
function
Alternate
functions
LQFP64
Push button
LED
SWD
OSC
Free I/O
Power supply
CN3
P1 P2
BOOT0 BOOT0 60 6
NRST NRST 7
RESET
NRST
510
PA0
WKUP1/RTC_TAMP2/
TIM2_CH1_ETR/
USART2_CTS/ADC_IN0/
COMP1_INP
14
USER
15
PA1
TIM2_CH2/USART2_RTS/
LCD_SEG0/ADC_IN1/
COMP1_INP/OPAMP1_VINP
15
16
PA2
TIM2_CH3/TIM9_CH1/
USART2_TX/LCD_SEG1/
ADC_IN2/COMP1_INP/
OPAMP1_VINM
16
17
PA3
TIM2_CH4/TIM9_CH2/
USART2_RX/LCD_SEG2/
ADC_IN3/COMP1_INP/
OPAMP1_VOUT
17
18
PA4
SPI1_NSS/SPI3_NSS/
I2S3_WS/USART2_CK/
ADC_IN4/DAC_OUT1/
COMP1_INP
20
21
PA5
TIM2_CH1_ETR/SPI1_SCK
/ADC_IN5/DAC_OUT2/
COMP1_INP
21
22
PA6
TIM3_CH1/TIM10_CH1/
SPI1_MISO/LCD_SEG3/
ADC_IN6/COMP1_INP/
OPAMP2_VINP
22
23