MC68HC908JW32_09 Datasheet, PDF (98/232 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Monitor Mode (MON)
FROM HOST
READ
READ
ADDRESS ADDRESS ADDRESS ADDRESS
HIGH
HIGH
LOW
LOW
4
1
4
1
4
1
3, 2
ECHO
Notes:
1 = Echo delay, approximately 2 bit times
2 = Data return delay, approximately 2 bit times
3 = Cancel command delay, 11 bit times
4 = Wait 1 bit time before sending next byte.
Figure 7-4. Read Transaction
FROM HOST
DATA
4
RETURN
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 7-5. Write Transaction
A brief description of each monitor mode command is given in Table 7-4 through Table 7-9.
Table 7-4. 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
ECHO
READ
ADDRESS ADDRESS ADDRESS ADDRESS
HIGH
HIGH
LOW
LOW
DATA
RETURN
MC68HC908JW32 Data Sheet, Rev. 6
98
Freescale Semiconductor