Maxim Integrated MAXQ7666 - Manual (Page 307)

Table 11-1 shows the background mode commands supported by the MAXQ7665/MAXQ7666. Encodings not listed in this table are
not supported in background mode and are treated as no operations.
A command can consist of multiple-byte transactions between the external host and the debug engine via the TAP. However, a com-
mand code is always 8 bits and is always transmitted first, followed by address and/or data when needed.
MAXQ7665/MAXQ7666 User’s Guide
11-11
Table 11-1. Background Mode Commands
OP CODE COMMAND OPERATION
0000-0000 No Operation No Operation. Default state for Debug Shift register.
0000-0001 Read ICDC
Read Control Data from the ICDC. The contents of the ICDC register are loaded into the Debug Shift Register via the
ICDB register for host read. This command requires one follow-on transfer cycle.
0000-0010 Read ICDF
Read Flags from the ICDF. The contents of the ICDF register (one byte) are loaded into the Debug Shift Register via the
ICDB register for host read. This command requires one follow-on transfer cycle.
0000-0011 Read ICDA
Read Data from the ICDA. The contents of the ICDA register are loaded into the Debug Shift Register via the ICDB
register for host read. This command requires two follow-on transfer cycles with the least significant byte first.
0000-0100 Read ICDD
Read Data from the ICDD. The contents of the ICDD register are loaded into the Debug Shift Register via the ICDB
register for host read. This command requires two follow-on transfer cycles with the least significant byte first.
0000-0101 Read BP0
Read Data from the BP0. The contents of the BP0 register are loaded into the Debug Shift Register via the ICDB
register for host read. This command requires two follow-on transfer cycles with the least significant byte first.
0000-0110 Read BP1
Read Data from the BP1. The contents of the BP1 register are loaded into the Debug Shift Register via the ICDB
register for host read. This command requires two follow-on transfer cycles with the least significant byte first.
0000-0111 Read BP2
Read Data from the BP2. The contents of the BP2 register are loaded into the Debug Shift Register via the ICDB
register for host read. This command requires two follow-on transfer cycles with the least significant byte first.
0000-1000 Read BP3
Read Data from the BP3. The contents of the BP3 register are loaded into the Debug Shift Register via the ICDB
register for host read. This command requires two follow-on transfer cycles with the least significant byte first.
0000-1001 Read BP4
Read Data from the BP4. The contents of the BP4 register are loaded into the Debug Shift Register via the ICDB
register for host read. This command requires two follow-on transfer cycles with the least significant byte first.
0000-1010 Read BP5
Read Data from the BP5. The contents of the BP5 register are loaded into the Debug Shift Register via the ICDB
register for host read. This command requires two follow-on transfer cycles with the least significant byte first.
0001-0001 Write ICDC
Write Control Data to the ICDC. The contents of ICDB are loaded into the ICDC register by the debug engine at the
end of the data transfer cycle.
0001-0011 Write ICDA
Write Data to the ICDA. The contents of ICDB are loaded into the ICDA register by the debug engine at the end
of the data transfer cycles. Data is transferred with the least significant byte first.
0001-0100 Write ICDD
Write Data to the ICDD. The contents of ICDB are loaded into the ICDD register by the debug engine at the end
of data transfer cycles. Data is transferred with the least significant byte first.
0001-0101 Write BP0
Write Data to the BP0. The contents of ICDB are loaded into the BP0 register by the debug engine at the end of data
transfer cycles. Data is transferred with the least significant byte first.
0001-0110 Write BP1
Write Data to the BP1. The contents of ICDB are loaded into the BP1 register by the debug engine at the end of data
transfer cycles. Data is transferred with the least significant byte first.
0001-0111 Write BP2
Write Data to the BP2. The contents of ICDB are loaded into the BP2 register by the debug engine at the end of data
transfer cycles. Data is transferred with the least significant byte first.
0001-1000 Write BP3
Write Data to the BP3. The contents of ICDB are loaded into the BP3 register by the debug engine at the end of data
transfer cycles. Data is transferred with the least significant byte first.
0001-1001 Write BP4
Write Data to the BP4. The contents of ICDB are loaded into the BP4 register by the debug engine at the end of data
transfer cycles. Data is transferred with the least significant byte first.
0001-1010 Write BP5
Write Data to the BP5. The contents of ICDB are loaded into the BP5 register by the debug engine at the end of data
transfer cycles. Data is transferred with the least significant byte first.
0001-1111 Debug
Debug Command. This command forces the debug engine into debug mode and halts the CPU operation at the
completion of the current instruction after the debug engine recognizes the debug command.
Maxim Integrated