Datasheet

Monitor ROM (MON)
MC68HC908LJ12 — Rev. 2.1 Technical Data
Freescale Semiconductor Monitor ROM (MON) 167
A sequence of IREAD or IWRITE commands can access a block of
memory sequentially over the full 64k-byte memory map.
Table 10-7. IWRITE (Indexed Write) Command
Description Write to last address accessed + 1
Operand Single data byte
Data
Returned
None
Opcode $19
Command Sequence
Table 10-8. READSP (Read Stack Pointer) Command
Description Reads stack pointer
Operand None
Data
Returned
Returns incremented stack pointer value (SP + 1) in
high-byte:low-byte order
Opcode $0C
Command Sequence
IWRITE
IWRITE
ECHO
FROM
HOST
DATA DATA
READSP
READSP
ECHO
FROM
HOST
SP
RETURN
SP
HIGH LOW