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STM32W108HB Datasheet(PDF) 239 Page - STMicroelectronics |
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STM32W108HB Datasheet(HTML) 239 Page - STMicroelectronics |
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239 / 278 page  STM32W108HB STM32W108CC STM32W108CB STM32W108CZ Debug support Doc ID 16252 Rev 14 239/278 13.1 STM32W108 JTAG TAP connection The STM32W108 MCU integrates two serially-connected JTAG TAPs in the following order; the TMC TAP dedicated for Test (IR is 4-bit wide) and the Cortex™-M3 TAP (IR is 4-bit wide). To access the TAP of the Cortex-M3 for debug purposes: 1. First, it is necessary to shift the BYPASS instruction of the TMC TAP. 2. Then, for each IR shift, the scan chain contains 8 bits (= 4 + 4) and the unused TAP instruction must be shifted in using the BYPASS instruction. 3. For each data shift, the unused TAP, which is in BYPASS mode, adds 1 extra data bit in the data scan chain. Note: Important: Once Serial-Wire is selected using the dedicated ARM JTAG sequence, the TMC TAP is automatically disabled (JTMS forced high). |
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