Datasheet

Monitor Module (MON)
MC68HC908GZ60 • MC68HC908GZ48 • MC68HC908GZ32 Data Sheet, Rev. 6
Freescale Semiconductor 311
Figure 20-14. Read Transaction
Figure 20-15. Write Transaction
A brief description of each monitor mode command is given in Table 20-3 through Table 20-8.
Table 20-3. 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
READ
READ
ECHO
FROM
HOST
ADDRESS
HIGH
ADDRESS
HIGH
ADDRESS
LOW
ADDRESS
LOW
DATA
RETURN
13, 2114
4
Notes:
2 = Data return delay, approximately 2 bit times
3 = Cancel command delay, 11 bit times
4 = Wait 1 bit time before sending next byte.
44
1 = Echo delay, approximately 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.
11311
3
3
32, 3
1 = Echo delay, approximately 2 bit times
READREAD
ECHO
SENT TO MONITOR
ADDRESS
HIGH
ADDRESS
HIGH
ADDRESS
LOW
DATA
RETURN
ADDRESS
LOW