PC912XDP512F0CFVR datasheet(747/1348 Pages) FREESCALE

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Chapter 20 S12X Debug (S12XDBGV3) Module

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

749

20.3.2

This section consists of the S12XDBG 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 S12XDBG module register address map. When ARM is set in DBGC1, the only bits in the

S12XDBG module registers that can be written are ARM, TRIG, and COMRV[1:0]

20.3.2.1

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 5:2 anytime S12XDBG is not armed.

NOTE

When disarming the S12XDBG by clearing ARM with software, the

contents of bits[5:2] 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.

0x002A

DBGXAM

Bit 15

Bit 8

0x002B

DBGXAL

Bit 7

4321

Bit 0

0x002C

DBGXDH

Bit 15

Bit 8

0x002D

DBGXDL

Bit 7

4321

Bit 0

0x002E

DBGXDHM

Bit 15

Bit 8

0x002F

DBGXDLM

Bit 7

4321

Bit 0

1 This represents the contents if the Comparator A or C control register is blended into this address.

2 This represents the contents if the Comparator B or D control register is blended into this address

Address: 0x0020

76543210

ARM

XGSBPE

BDM

DBGBRK

COMRV

TRIG

Reset

00000000

Figure 20-3. Debug Control Register (DBGC1)

Address

Name

Bit 7

4321

Bit 0

Figure 20-2. Quick Reference to S12XDBG Registers

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