mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 529

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
MSCMD
MCMD
Field
CRG
CRN
R/W
3–0
3–2
1–0
7–6
4–0
SZ
5
Read/Write.
0 Command is performing a write operation.
1 Command is performing a read operation.
Miscellaneous command. Defines the miscellaneous command to be performed.
0000 No operation
0001 Display the CPU’s program counter (PC) plus optional capture in the PST trace buffer
0010 Enable the BDM acknowledge communication mode
0011 Disable the BDM acknowledge communication mode
0100 Force a CPU halt (background)
1000 Resume CPU execution (go)
1101 Read/write of the debug XCSR most significant byte
1110 Read/write of the debug CSR2 most significant byte
1111 Read/write of the debug CSR3 most significant byte
Memory operand size. Defines the size of the memory reference.
00 8-bit byte
01 16-bit word
10 32-bit long
Memory command. Defines the type of the memory reference to be performed.
00 Simple write if R/W = 0; simple read if R/W = 1
01 Write + status if R/W = 0; read + status if R/W = 1
10 Fill if R/W = 0; dump if R/W = 1
11 Fill + status if R/W = 0; dump + status if R/W = 1
Core register group. Defines the core register group to be referenced.
01 CPU’s general-purpose registers (An, Dn) or PST trace buffer
10 Debug’s control registers
11 CPU’s control registers (PC, SR, VBR, CPUCR,...)
Core register number. Defines the specific core register (its number) to be referenced. All other CRN values are
reserved.
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
Table 22-24. BDM Command Field Descriptions
CRG
01
10
11
0x00–0x07
0x08–0x0F
0x10–0x1B
Description
DRc[4:0] as described in
0x0E
CRN
0x00
0x01
0x02
0x0F
PST Buffer 0–11
Table 22-4
Version 1 ColdFire Debug (CF1_DEBUG)
OTHER_A7
Register
CPUCR
D0–7
A0–7
VBR
SR
PC
22-37