MC68HC908QL4 Datasheet, PDF (199/226 Pages) Motorola, Inc – Microcontrollers

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 16-15. Read Transaction
FROM
HOST
Monitor Module (MON)
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 16-16. Write Transaction
A brief description of each monitor mode command is given in Table 16-3 through Table 16-8.
Table 16-3. 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
ECHO
READ
ADDRESS ADDRESS ADDRESS ADDRESS
HIGH
HIGH
LOW
LOW
DATA
RETURN
MC68HC908QL4 Data Sheet, Rev. 7
Freescale Semiconductor
199