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AN4035 bảng dữ liệu(PDF) 12 Page - STMicroelectronics

tên linh kiện AN4035
Giải thích chi tiết về linh kiện  Flash programming through
PDF  42 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4035 bảng dữ liệu(HTML) 12 Page - STMicroelectronics

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JTAG
AN4035
12/41
Doc ID 022669 Rev 2
Note:
If the shadow flash block is erased without reprogramming a new valid password before a
reset, it contains an illegal password and the debug port is inaccessible.
4.
Subsequent resets clear the JTAG censor password register and the Nexus client TAP
controller holds in reset again. Therefore, the tool must resend the JTAG serial
password, as described above, in order to enable the Nexus client TAP controller
again.
2.5.1
CENSOR_CTRL register
The CENSOR_CTRL register is an shift register path from TDI to TDO selected when the
ENABLE_CENSOR_CTRL instruction is active. The CENSOR_CTRL register transfers its
value to a parallel hold register on the rising edge of TCK when the TAP controller state
machine is in the Update-DR state. The parallel hold register bits CENSOR_CTRL
correspond directly to the JTAGC output control internal signals jtag_censor_ctrl. The
jtag_censor_ctrl signals are used to control chip dependent censorship features. Once the
ENABLE_CENSOR_CTRL instruction is executed, jtag_censor_ctrl remains valid until a
JTAGC reset occurs.



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