參數(shù)資料
型號: 68HC705BD7
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數(shù): 58/85頁
文件大小: 302K
代理商: 68HC705BD7
MOTOROLA
Page 48
SECTION 9: DDC12AB INTERFACE
GENERAL RELEASE SPECIFICATION
MC68HC05BD7 Rev. 2.0
Figure 9-2: Software Flowchart in Master mode: (a) Mode setup. (b) Interrupt routine
DDTR <= $FF
MAST <= 0
*restore DADR
*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
TXIF =1
MRW =1
Data
N
Clr TXIF
End of
Data
Y
N
Clear ALIF Set
"Failure" flag
for retry
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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