PC912XDP512F0MPVR datasheet(760/1348 Pages) FREESCALE

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Chapter 20 S12X Debug (S12XDBGV3) Module

MC9S12XDP512 Data Sheet, Rev. 2.21

762

Freescale Semiconductor

20.3.2.7.4

Debug Match Flag Register (DBGMFR)

Read: Anytime

Write: Never

DBGMFR is visible at 0x0027 only with COMRV[1:0] = 11. It features four ﬂag bits each mapped directly

to a channel. Should a match occur on the channel during the debug session, then the corresponding ﬂag

is set and remains set until the next time the module is armed by writing to the ARM bit. Thus the contents

are retained after a debug session for evaluation purposes. These ﬂags cannot be cleared by software, they

are cleared only when arming the module. A set ﬂag does not inhibit the setting of other ﬂags. Once a ﬂag

is set, further triggers on the same channel have no affect.

20.3.2.8

Comparator Register Descriptions

Each comparator has a bank of registers that are visible through an 8-byte window in the S12XDBG

module register address map. Comparators A and C consist of 8 register bytes (3 address bus compare

registers, two data bus compare registers, two data bus mask registers and a control register).

Comparators B and D consist of four register bytes (three address bus compare registers and a control

Each set of comparator registers is accessible in the same 8-byte window of the register address map and

can be accessed using the COMRV bits in the DBGC1 register. If the Comparators B or D are accessed

through the 8-byte window, then only the address and control bytes are visible, the 4 bytes associated with

data bus and data bus masking read as zero and cannot be written. Furthermore the control registers for

comparators B and D differ from those of comparators A and C.

Address: 0x0027

76543210

0000

MC3

MC2

MC1

MC0

Reset

00000000

= Unimplemented or Reserved

Figure 20-12. Debug Match Flag Register (DBGMFR)

Table 20-26. Comparator Register Layout

0x0028

CONTROL

Read/Write

—

0x0029

ADDRESS HIGH

Read/Write

—

0x002A

ADDRESS MEDIUM

Read/Write

—

0x002B

ADDRESS LOW

Read/Write

—

0x002C

DATA HIGH COMPARATOR

Read/Write

Comparator A and C only

0x002D

DATA LOW COMPARATOR

Read/Write

Comparator A and C only

0x002E

DATA HIGH MASK

Read/Write

Comparator A and C only

0x002F

DATA LOW MASK

Read/Write

Comparator A and C only

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