NXP Semiconductors MC9S12G - Register Descriptions

S12S Debug Module (S12SDBGV2)
MC9S12G Family Reference Manual Rev.1.27
NXP Semiconductors 309
8.3.2 Register Descriptions
This section consists of the DBG control and trace buffer register descriptions in address order. Each
comparator has a bank of registers that are visible through an 8-byte window between 0x0028 and 0x002F
in the DBG module register address map. When ARM is set in DBGC1, the only bits in the DBG module
registers that can be written are ARM, TRIG, and COMRV[1:0].
8.3.2.1 Debug Control Register 1 (DBGC1)
Read: Anytime
Write: Bits 7, 1, 0 anytime
Bit 6 can be written anytime but always reads back as 0.
Bits 4:3 anytime DBG is not armed.
NOTE
When disarming the DBG by clearing ARM with software, the contents of
bits[4:3] are not affected by the write, since up until the write operation,
ARM = 1 preventing these bits from being written. These bits must be
cleared using a second write if required.
0x002C DBGADH
R
Bit 15 14 13 12 11 10 9 Bit 8
W
0x002D DBGADL
R
Bit 7654321Bit 0
W
0x002E DBGADHM
R
Bit 15 14 13 12 11 10 9 Bit 8
W
0x002F DBGADLM
R
Bit 7654321Bit 0
W
1
This bit is visible at DBGCNT[7] and DBGSR[7]
2
This represents the contents if the Comparator A control register is blended into this address.
3
This represents the contents if the Comparator B control register is blended into this address
4
This represents the contents if the Comparator C control register is blended into this address
Address: 0x0020
76543210
R
ARM
00
BDM DBGBRK
0
COMRV
WTRIG
Reset00000000
= Unimplemented or Reserved
Figure 8-3. Debug Control Register (DBGC1)
Address Name Bit 7 6 5 4 3 2 1 Bit 0
Figure 8-2. Quick Reference to DBG Registers