Datasheet

Monitor ROM (MON)
MC68HC908GR16 Data Sheet, Rev. 5.0
Freescale Semiconductor 249
Figure 19-16. Write Transaction
A brief description of each monitor mode command is given in Table 19-3 through Table 19-8.
Table 19-3. 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
Table 19-4. WRITE (Write Memory) Command
Description Write byte to memory
Operand 2-byte address in high-byte:low-byte order; low byte followed by data byte
Data Returned None
Opcode $49
Command Sequence
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
READ
READ
ECHO
SENT TO MONITOR
ADDRESS
HIGH
ADDRESS
HIGH
ADDRESS
LOW
DATA
RETURN
ADDRESS
LOW
WRITE
WRITE
ECHO
FROM HOST
ADDRESS
HIGH
ADDRESS
HIGH
ADDRESS
LOW
ADDRESS
LOW
DATA DATA