STM32W108CBU6 STMICROELECTRONICS [STMicroelectronics], STM32W108CBU6 Datasheet - Page 48

• Manufacturer Part Number: STM32W108CBU6
• Description: High-performance, IEEE 802.15.4 wireless system-on-chip
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

General-purpose input/outputs
6.1.3
Note:
48/179
Several GPIOs share an alternate output with Timer 2 and the Serial Controllers. Bits in
Timer 2's TIM2_OR register control routing Timer 2 outputs to different GPIOs. Bits in Timer
2's TIM2_CCER register enable Timer 2 outputs. When Timer 2 outputs are enabled they
override Serial Controller outputs.
depending on the bits in the register TIM2_OR. Refer to
on page 80
Table 5.
For outputs assigned to the serial controllers, the serial interface mode registers
(SCx_MODE) determine how the GPIO pins are used.
The alternate outputs of PA4 and PA5 can either provide packet trace data (PTI_EN and
PTI_DATA), or synchronous CPU trace data (TRACEDATA2 and TRACEDATA3).
If a GPIO does not have an associated peripheral in alternate output mode, its output is set
to 0.
Forced functions
For some GPIOs the GPIO_PxCFGH/L configuration may be overridden.
GPIOs that can have different functions forced on them regardless of the GPIO_PxCFGH/L
registers.
The DEBUG_DIS bit in the GPIO_DBGCFG register can disable the Serial Wire/JTAG
debugger interface. When this bit is set, all debugger-related pins (PC0, PC2, PC3, PC4)
behave as standard GPIO.
Table 6.
GPIO
PC0
PC2
PC3
PC4
PC4
PA7
Timer 2 Output
TIM2_CH1
TIM2_CH2
TIM2_CH3
TIM2_CH4
GPIO_EXTREGEN bit set in the
GPIO_DBGCFG register
Debugger interface is active in JTAG mode
Debugger interface is active in JTAG mode
Debugger interface is active in JTAG mode
Debugger interface is active in JTAG mode
Debugger interface is active in Serial Wire
mode
for complete information on timer configuration.
Timer 2 output configuration controls
GPIO forced functions
Override condition
Option Register Bit
TIM2_OR[4]
TIM2_OR[5]
TIM2_OR[6]
TIM2_OR[7]
Doc ID 16252 Rev 2
Table 5
indicates the GPIO mapping for Timer 2 outputs
GPIO Mapping Selected by TIM2_OR Bit
Open-drain output
Input with pull up
Push-pull output
Input with pull up
Input with pull up
Bidirectional (push-pull
output or floating
input) controlled by
debugger interface
PA0
PA3
PA1
PA2
Forced function
Section 8: General-purpose timers
0
STM32W108CB, STM32W108HB
Table 6
REG_EN
JRST
JTDO
JDTI
JTMS
SWDIO
Forced signal
PB1
PB2
PB3
PB4
1
shows the