參數(shù)資料
型號(hào): MC68HC705BD7B
廠商: MOTOROLA INC
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP42
封裝: SDIP-42
文件頁(yè)數(shù): 54/85頁(yè)
文件大?。?/td> 302K
代理商: MC68HC705BD7B
MOTOROLA
SECTION 9: DDC12AB INTERFACE
Page 48
GENERAL RELEASE SPECIFICATION
MC68HC05BD7 Rev. 2.0
PRELIMINARY
Figure 9-2: Software Flowchart in Master mode: (a) Mode setup. (b) Interrupt routine
DDTR <= $FF
MAST <= 0
*restore DADR
RESET
BB =1?
Read or
Write ?
MRW<=0
DDTR <= 1st
Data
Y
N
Read
Write
(a) Master mode setup
Interrupt
ALIF =1?
Y
N
NAKIF
=1?
Y
N
TXIF =1?
Y
N
MRW =1?
Y
N
End of
Data?
Y
N
Clr TXIF
End of
Data?
Y
N
Clear ALIF Set
"Failure" flag
for retry
*restore DADR
Clr NAKIF
Set
"Incomplete"
flag for retry
DDTR <=
Next Data
Clear RXIF
Read DDRR
Next data is
the last?
N
Y
TXAK <= 1
*restore DADR
RTI
(b) Master mode interrupt routine
WAIT
MRW<=1
*** TXAK is 1 when master
want receive only one byte
SEI
CLI
DEN <= 1
DIEN <= 1
DADR <= TXAD**
TXAK <= 0 or 1***
** TXAD means transmit address
* Restore its own specific slave address
RXIF =1?
N
Y
MAST<=1
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