MC68HC908LJ24 Datasheet, PDF (173/464 Pages) Motorola, Inc – Microcontrollers

Monitor ROM (MON)
Functional Description
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, 2 bit times
2 = Data return delay, 2 bit times
3 = Cancel command delay, 11 bit times
4 = Wait 1 bit time before sending next byte.
Figure 10-5. 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, 2 bit times
2 = Cancel command delay, 11 bit times
3 = Wait 1 bit time before sending next byte.
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
SENT TO
MONITOR
READ
ECHO
READ
ADDRESS ADDRESS ADDRESS
HIGH
HIGH
LOW
ADDRESS
LOW
DATA
RETURN
MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor
Monitor ROM (MON)
Data Sheet
173