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參數(shù)資料
| 型號： | ST78C34IP40 |
| 廠商： | STARTECH SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | GENERAL PURPOSE PARALLEL PRINTER PORT WITH 83 BYTE FIFO |
| 中文描述： | 17 I/O, PIA-PRINTER INTERFACE, PDIP40 |
| 文件頁數(shù)： | 8/21頁 |
| 文件大?。?/td> | 198K |
| 代理商： | ST78C34IP40 |
6-10
ST78C34
Rev. 3.00
COM BIT-2:
INIT input pin.
0= INIT pin is in low state
1= INIT pin is in high state
COM BIT-3:
-SLCTIN input pin.
0= -SLCTIN pin is in high state
1= -SLCTIN pin is in low state
COM BIT-4:
Interrupt mask.
0= Interrupt (INT output) is disabled
1= Interrupt (INT output) is enabled
COM BIT 7-5:
Not used. Are set to “1” permanently.
CONTROL REGISTER.
Writing to this register will set the state of the -
STROBE, -AUTOFDXT, INIT, SLCTIN pins, and in-
terrupt mask register.
CON BIT-0:
-STROBE output control bit.
0= -STROBE output is set to high state
1= -STROBE output is set to low state
CON BIT-1:
-AUTOFDXT output control bit.
0= -AUTOFDXT output is set to high state
1= -AUTOFDXT output is set to low state
CON BIT-2:
INIT output control bit.
0= INIT output is set to low state
1= INIT output is set to high state
CON BIT-3:
-SLCTIN output control bit.
0= -SLCTIN output is set to high state
1= -SLCTIN output is set to low state
CON BIT-4:
Interrupt output control bit.
0= INT output is disabled (three state mode)
1= INT output is enabled
CON BIT-5:
I/O select. Direction of the PD7-PD0 can be selected
by setting or clearing this bit.
0= PD7-PD0 are set for output mode
1= PD7-PD0 are set for input mode
CON BIT 7-6:
Not used.
ALTERNATE FUNCTION REGISTER (AFR)
This register En/Disables FIFO operation and pro-
vides additional capabilities to control -STROBE. INT
and change interrupt functions.
AFR BIT 0-2:
Timing select.
The -STROBE delay and width can be controlled by
these bits.
AFR
Bit-2
AFR
Bit-1
AFR
Bit-0
TSD
(clocks)
TSW
(clocks)
1
1
1
1
0
0
0
0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
3
5
5
9
6
10
10
18
2
4
4
8
4
8
8
16
AFR BIT-3:
Interrupt source.
0= -ACK input pin is selected as printer handshaking
source
1= BUSY input pin is selected as printer handshaking
source
AFR BIT 4-5:
Interrupt type. State of the INT output pin can be
selected for one of the following options.
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