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參數(shù)資料
| 型號(hào)： | ST78C34CP40-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 20/21頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC UART FIFO 83B 40PDIP |
| 標(biāo)準(zhǔn)包裝： | 9 |
| 特點(diǎn)： | * |
| FIFO's： | 83 字節(jié) |
| 規(guī)程： | 打印機(jī) |
| 電源電壓： | 5V |
| 帶并行端口： | 是 |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 40-DIP（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 40-PDIP |
| 包裝： | 管件 |
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
TSD
TSW
Bit-2
Bit-1
Bit-0
(clocks)
100
3
2
101
5
4
110
5
4
111
9
8
000
6
4
001
10
8
010
10
8
0
1
18
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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