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參數(shù)資料
| 型號： | ST78C34CP40-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 16/21頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC UART FIFO 83B 40PDIP |
| 標(biāo)準(zhǔn)包裝： | 9 |
| 特點： | * |
| FIFO's： | 83 字節(jié) |
| 規(guī)程： | 打印機 |
| 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 |
6-6
ST78C34
Rev. 3.00
SYMBOL DESCRIPTION
Symbol
Pin
Signal
Pin Description
40
44
type
-ERROR
1
I
General purpose input or line printer error (active low, with internal
pull-up). This is an output from the printer to indicate an error by
holding it low during error condition.
SLCT
2
I
General purpose input or line printer selected (active high, with
internal pull-up). This is an output from the printer to indicate that
the line printer has been selected.
BUSY
3
I
General purpose input or line printer busy (active high, with internal
pull-up). An output from the printer to indicate printer is not ready
to accept data.
-ACK
4
I
General purpose input or line printer acknowledge (active low, with
internal pull-up). An output from the printer to indicate that data has
been accepted successfully.
PE
5
I
General purpose input or line printer paper empty (active high, with
internal pull-up). An output from the printer to indicate out of paper.
INTSEL
6
8
I
Interrupt select mode. The external -ACK can be selected as an
interrupt source by connecting this pin to the VCC or left open.
Connecting this pin to GND will set the interrupt to latched mode,
reading the status register resets the INT output.
D0-D7
14-7
16-9
I/O
Bi-directional data bus. Eight bit, three state data bus to transfer
information to or from the CPU. D0 is the least significant bit of
the data bus.
INT
16
19
O
Interrupt output (selectable active low or high). To signal the state
of the printer port. This pin tracks the -ACK input pin, When -ACK
is low INT is low and when -ACK is high INT is high if selected as
active low interrupt.
XTAL1
17
20
I
Crystal input 1 or external clock input. A crystal can be connected
to this pin and XTAL2 pin to utilize the internal oscillator circuit. An
external clock can be used to clock oscillator circuit.
XTAL2
18
21
O
Crystal input 2 or buffered clock output. See XTAL1.
-CS
19
22
I
Chip select (active low). A low at this pin enables the ST78C34 /
CPU data transfer operation.
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| ST78C34IJ44 | 制造商:EXAR 制造商全稱:EXAR 功能描述:GENERAL PURPOSE PARALLEL PRINTER PORT WITH 83 BYTE FIFO |
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| ST78C36_05 | 制造商:EXAR 制造商全稱:EXAR 功能描述:ECP/EPP PARALLEL PRINTER PORT WITH 16-BYTE FIFO |
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