Table 980. Rdback Register Format - STMicroelectronics SPC572L series Reference Manual

RM0400
60.6.2.3.9 Auxiliary Pin Function Control (APFC[1:0])
This register enables TDI and TDO alternate functions when 2-pin TAP.7 operation is
selected.
•
0x – TDI and TDO have JTAG function.
•
1x – TDI and TDO have alternate function.
Set using STC2 command.
Read using SCNS, RDBACK0.
60.6.2.3.10 Conditional Group Member (CGM)
Used by STC1, STC2, STTESTM, and EXC3 – EXC0 commands as the "condition" for
updating registers.
Set and cleared using MCM and SCNB commands.
Read using SCNS, RDBACK0.
60.6.2.3.11 Scan Group Candidate (SGC)
This register determines whether the STL is coupled when the Run-Test/Idle state is
reached when scan formats other than JScan0 and JScan1 are used.
•
0 – Decoupling action.
• 1 – Coupling action.
Set and cleared using STMC, MSC, and SCNB commands.
Read using SCNS, RDBACK0.
60.6.2.3.12 Sampling Edge (SEDGE)
The Sampling Edge register defines the TCKC edge used to sample the TMSC input.
•
0 – Sample TMSC on the TCKC falling edge.
•
1 – Sample TMSC on the TCKC rising edge.
Set and cleared using STC1 command.
Read using SCNS, RDBACK0
60.6.2.3.13 Read Back 0 (RDBACK0)
Non-transport related register information.
Read using SCNS command.
Unimplemented registers shall read back as "0".
Bit
4:0
6:5
7
8
IEEE 1149.7 Compact JTAG Test Access Port Controller (CJTAG)

Table 980. RDBACK register format

Width Register Mnemonic
5 SCNFMT
2 PWRMODE
1 FRESET
1 TRESET
DocID027809 Rev 4
Name
Scan Format
Power-control Modes
Functional Reset
Test Reset
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