s908qc16vdse Freescale Semiconductor, Inc, s908qc16vdse Datasheet - Page 231

• Manufacturer Part Number: s908qc16vdse
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

The monitor ROM firmware echoes each received byte back to the PTA0 pin for error checking. An 11-bit
delay at the end of each command allows the host to send a break character to cancel the command. A
delay of two bit times occurs before each echo and before READ, IREAD, or READSP data is returned.
The data returned by a read command appears after the echo of the last byte of the command.
A brief description of each monitor mode command is given in
Freescale Semiconductor
Data Returned
3
Wait one bit time after each echo before sending the next byte.
Notes:
SENT TO MONITOR
ECHO
Notes:
1 = Echo delay, approximately 2 bit times
2 = Data return delay, approximately 2 bit times
WRITE
ECHO
1 = Echo delay, approximately 2 bit times
2 = Cancel command delay, 11 bit times
3 = Wait 1 bit time before sending next byte.
Description
ECHO
4
FROM
HOST
FROM
HOST
Operand
READ
READ
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 4
Opcode
1
WRITE
1
READ
READ
Table 18-3. READ (Read Memory) Command
Read byte from memory
2-byte address in high-byte:low-byte order
Returns contents of specified address
$4A
3
ADDRESS
4
HIGH
ADDRESS
ADDRESS
Figure 18-15. Read Transaction
Figure 18-16. Write Transaction
HIGH
HIGH
1
ADDRESS
1
HIGH
ADDRESS
Command Sequence
ADDRESS
HIGH
HIGH
3
ADDRESS
NOTE
4
LOW
ADDRESS
ADDRESS
LOW
LOW
3 = Cancel command delay, 11 bit times
4 = Wait 1 bit time before sending next byte.
1
ADDRESS
1
LOW
ADDRESS
ADDRESS
LOW
LOW
3
DATA
Table 18-3
3, 2
1
DATA
DATA
DATA
through
RETURN
RETURN
4
2, 3
Monitor Module (MON)
Table
18-8.
231