MC68HC908QB8 Datasheet, PDF (203/236 Pages) Freescale Semiconductor, Inc – To provide the most up-to-date information, the revision of our documents

FROM
HOST
Monitor Module (MON)
READ
READ
ADDRESS ADDRESS ADDRESS ADDRESS
HIGH
HIGH
LOW
LOW
4
1
4
1
4
1
3, 2
DATA
4
ECHO
Notes:
1 = Echo delay, approximately 2 bit times
2 = Data return delay, approximately 2 bit times
RETURN
3 = Cancel command delay, 11 bit times
4 = Wait 1 bit time before sending next byte.
Figure 17-15. Read Transaction
FROM
HOST
WRITE
WRITE
ADDRESS ADDRESS ADDRESS ADDRESS
HIGH
HIGH
LOW
LOW
DATA
DATA
3
1
3
1
3
1
3
1
2, 3
ECHO
Notes:
1 = Echo delay, approximately 2 bit times
2 = Cancel command delay, 11 bit times
3 = Wait 1 bit time before sending next byte.
Figure 17-16. Write Transaction
A brief description of each monitor mode command is given in Table 17-3 through Table 17-8.
Table 17-3. READ (Read Memory) Command
Description
Operand
Data Returned
Opcode
Read byte from memory
2-byte address in high-byte:low-byte order
Returns contents of specified address
$4A
Command Sequence
SENT TO MONITOR
READ
READ
ADDRESS ADDRESS ADDRESS ADDRESS
HIGH
HIGH
LOW
LOW
ECHO
DATA
RETURN
MC68HC908QB8 Data Sheet, Rev. 1
Freescale Semiconductor
203