General-purpose and alternate-function I/Os (GPIOs and AFIOs) RM0008
178/1096 Doc ID 13902 Rev 12
9.4.2 AF remap and debug I/O configuration register (AFIO_MAPR)
Address offset: 0x04
Reset value: 0x0000 0000
Memory map and bit definitions for low-, medium- high- and XL-density
devices:
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved
SWJ_
CFG[2:0]
Reserved
ADC2_
ETRGR
EG_RE
MAP
ADC2_ET
RGINJ_R
EMAP
ADC1_ET
RGREG_
REMAP
ADC1_
ETRGIN
J_REM
AP
TIM5CH
4_IREM
AP
w w w rw rw rw rw rw
151413121110987654 3 2 1 0
PD01_
REMAP
CAN_REMAP
[1:0]
TIM4_
REMAP
TIM3_REMAP
[1:0]
TIM2_REMAP
[1:0]
TIM1_REMAP
[1:0]
USART3_
REMAP[1:0]
USART2_
REMAP
USART1_
REMAP
I2C1_
REMAP
SPI1_
REMAP
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:27 Reserved
Bits 26:24 SWJ_CFG[2:0]: Serial wire JTAG configuration
These bits are write-only (when read, the value is undefined). They are used to configure the
SWJ and trace alternate function I/Os. The SWJ (Serial Wire JTAG) supports JTAG or SWD
access to the Cortex debug port. The default state after reset is SWJ ON without trace. This
allows JTAG or SW mode to be enabled by sending a specific sequence on the JTMS /
JTCK pin.
000: Full SWJ (JTAG-DP + SW-DP): Reset State
001: Full SWJ (JTAG-DP + SW-DP) but without NJTRST
010: JTAG-DP Disabled and SW-DP Enabled
100: JTAG-DP Disabled and SW-DP Disabled
Other combinations: no effect
Bits 23:21 Reserved.
Bits 20 ADC2_ETRGREG_REMAP: ADC 2 external trigger regular conversion remapping
Set and cleared by software. This bit controls the trigger input connected to ADC2 external
trigger regular conversion. When this bit is reset, the ADC2 external trigger regular
conversion is connected to EXTI11. When this bit is set, the ADC2 external event regular
conversion is connected to TIM8_TRGO.
Bits 19 ADC2_ETRGINJ_REMAP: ADC 2 external trigger injected conversion remapping
Set and cleared by software. This bit controls the trigger input connected to ADC2 external
trigger injected conversion. When this bit is reset, the ADC2 external trigger injected
conversion is connected to EXTI15. When this bit is set, the ADC2 external event injected
conversion is connected to TIM8_Channel4.
Bits 18 ADC1_ETRGREG_REMAP: ADC 1 external trigger regular conversion remapping
Set and cleared by software. This bit controls the trigger input connected to ADC1
External trigger regular conversion. When reset the ADC1 External trigger regular
conversion is connected to EXTI11. When set the ADC1 External Event regular conversion
is connected to TIM8 TRGO.
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