參數(shù)資料
型號(hào)： ST78C34CJ44-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 20/21頁(yè)
文件大?。?/td> 0K
描述： IC UART FIFO 83B 44PLCC
標(biāo)準(zhǔn)包裝： 27
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： 表面貼裝
封裝/外殼： 44-LCC（J 形引線）
供應(yīng)商設(shè)備封裝： 44-PLCC（16.59x16.59）
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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