參數(shù)資料
型號: MC68HC08QY2MDTE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
封裝: 0.65 MM PITCH, LEAD FREE, TSSOP-16
文件頁數(shù): 50/176頁
文件大?。?/td> 1124K
代理商: MC68HC08QY2MDTE
Monitor Module (MON)
MC68HC08QY/QT Family Data Sheet, Rev. 2
Freescale Semiconductor
143
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.
NOTE
Wait one bit time after each echo before sending the next byte.
Figure 15-13. Read Transaction
Figure 15-14. Write Transaction
A brief description of each monitor mode command is given in Table 15-3 through Table 15-8.
Table 15-3. 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
READ
ECHO
FROM
HOST
ADDRESS
HIGH
ADDRESS
HIGH
ADDRESS
LOW
ADDRESS
LOW
DATA
RETURN
13, 2
11
4
Notes:
2 = Data return delay, approximately 2 bit times
3 = Cancel command delay, 11 bit times
4 = Wait 1 bit time before sending next byte.
44
1 = Echo delay, approximately 2 bit times
WRITE
ECHO
FROM
HOST
ADDRESS
HIGH
ADDRESS
HIGH
ADDRESS
LOW
ADDRESS
LOW
DATA
Notes:
2 = Cancel command delay, 11 bit times
3 = Wait 1 bit time before sending next byte.
11
3
11
3
32, 3
1 = Echo delay, approximately 2 bit times
READ
ECHO
SENT TO MONITOR
ADDRESS
HIGH
ADDRESS
HIGH
ADDRESS
LOW
DATA
RETURN
ADDRESS
LOW
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