RM0008 Debug support (DBG)
Doc ID 13902 Rev 12 1055/1096
Figure 361. JTAG TAP connections
31.6 ID codes and locking mechanism
There are several ID codes inside the STM32F10xxx MCUs. ST strongly recommends tools
designers to lock their debuggers using the MCU DEVICE ID code located in the external
PPB memory map at address 0xE0042000.
31.6.1 MCU device ID code
The STM32F10xxx MCUs integrate an MCU ID code. This ID identifies the ST MCU part-
number and the die revision. It is part of the DBG_MCU component and is mapped on the
external PPB bus (see Section 31.16 on page 1068). This code is accessible using the
JTAG debug port (4 to 5 pins) or the SW debug port (two pins) or by the user software. It is
even accessible while the MCU is under system reset.
DBGMCU_IDCODE
Address: 0xE0042000
Only 32-bits access supported. Read-only.
Boundary scan
TAP
NJTRST
Cortex-M3 TAP
JTMS
TMS nTRSTTMS nTRST
JTDI
JTDO
TDI TDO TDI TDO
SW-DP
STM32F10xxx
Selected
IR is 5-bit wide IR is 4-bit wide
ai14981b
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
REV_ID
rrrrrrr r r r rrrrrr
1514131211109876543210
Reserved
DEV_ID
rrrrrrrrrrrr
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