Datasheet

Monitor ROM (MON)
MC68HC908LJ12 — Rev. 2.1 Technical Data
Freescale Semiconductor Monitor ROM (MON) 165
Figure 10-5. Read Transaction
Figure 10-6. Write Transaction
A brief description of each monitor mode command is given in
Table 10-4 through Table 10-9.
Table 10-4. READ (Read Memory) Command
Description Read byte from memory
Operand 2-byte address in high-byte:low-byte order
Data
Returned
Returns contents of specified address
Opcode $4A
Command Sequence
READ
READ
ECHO
FROM HOST
ADDRESS
HIGH
ADDRESS
HIGH
ADDRESS
LOW
ADDRESS
LOW
DATA
RETURN
13, 2114
4
Notes:
2 = Data return delay, 2 bit times
3 = Cancel command delay, 11 bit times
4 = Wait 1 bit time before sending next byte.
44
1 = Echo delay, 2 bit times
WRITE
WRITE
ECHO
FROM HOST
ADDRESS
HIGH
ADDRESS
HIGH
ADDRESS
LOW
ADDRESS
LOW
DATA
DATA
Notes:
2 = Cancel command delay, 11 bit times
3 = Wait 1 bit time before sending next byte.
113113
3
32, 3
1 = Echo delay, 2 bit times
READREAD
ECHO
SENT TO
MONITOR
ADDRESS
HIGH
ADDRESS
HIGH
ADDRESS
LOW
DATA
RETURN
ADDRESS
LOW