Freescale Semiconductor, Inc.
Monitor ROM (MON)
Functional Description
13.4.5 Commands
The monitor ROM uses these commands:
• READ, read memory
• WRITE, write memory
• IREAD, indexed read
• IWRITE, indexed write
• READSP, read stack pointer
• RUN, run user program
A sequence of IREAD or IWRITE commands can access a block of
memory sequentially over the full 64-Kbyte memory map.
Table 13-3. READ (Read Memory) Command
Description
Operand
Read byte from memory
Specifies 2-byte address in high byte:low byte order
Returns contents of specified address
$4A
Data Returned
Opcode
Command Sequence
SENT TO
MONITOR
READ
READ
ADDR. HIGH
ADDR. HIGH
ADDR. LOW
ADDR. LOW
DATA
ECHO
RESULT
Table 13-4. WRITE (Write Memory) Command
Description
Write byte to memory
Operand
Specifies 2-byte address in high byte:low byte order; low byte followed by data byte
Data Returned
Opcode
None
$49
Command Sequence
SENT TO
MONITOR
WRITE
ECHO
WRITE
ADDR. HIGH
ADDR. HIGH
ADDR. LOW
ADDR. LOW
DATA
DATA
MC68HC908AS60 — Rev. 1.0
Technical Data
Monitor ROM (MON)
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