MC68340 datasheet(215/441 Pages) FREESCALE

215 / 441 page

5- 78

MC68340 USER’S MANUAL

MOTOROLA

Result Data:

Always returns 32 bits of data, regardless of the size of the register being read. If the

The system control register is specified by the register field (see Table 5-24).

Table 5-24. Register Field for RSREG and WSREG

System Register

Select Code

Return Program Counter (RPC)

0000

Current Instruction Program Counter (PCC)

0001

Status Register (SR)

1011

User Stack Pointer (USP)

1100

Supervisor Stack Pointer (SSP)

1101

Source Function Code Register (SFC)

1110

Destination Function Code Register (DFC)

1111

Temporary Register A (ATEMP)

1000

Fault Address Register (FAR)

1001

Vector Base Register (VBR)

1010

5.6.2.8.7 Write System Register (WSREG). Operand data is written into the specified

system control register. All registers that can be written in supervisor mode can be written

in BDM. Several internal temporary registers are also accessible.

Command Format:

9876543

001001001000

Command Sequence:

MS DATA

XXX

"ILLEGAL"

LS DATA

"NOT READY"

NEXT CMD

"NOT READY"

"CMD COMPLETE"

NEXT CMD

WSREG

???

"NOT READY"

Operand Data:

The data to be written into the register is always supplied as a 32-bit long word. If the

Result Data:

“Command complete” status is returned when register write is complete.

Freescale Semiconductor, Inc.

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