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CH341A Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers

No. de pieza CH341A
Descripción Electrónicos  CH341 is a USB bus convert chip, providing UART, printer port, parallel and synchronous serial with 2-wire or 4-wire through USB bus
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Fabricante Electrónico  ETC2 [List of Unclassifed Manufacturers]
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The DataSheet of CH341 (the first)
5
26
INI#
OUT
Initialize printer, low-level active, connect to INIT
3
SIN#
Tri-state
Output
Select printer, low-level active, connect to SELECT-IN
5
ERR#
IN
Error with printer, low-level active, with pull-up resistor,
connect to ERROR or FAULT
8
SLCT
IN
Printer is selected, high-level active, with pull-up resistor,
connect to SELECT or SLCT
6
PEMP
IN
Printer is short of papers, high-level active, connect to
PEMPTY or PERROR
7
ACK#
IN
Printer data receive answer, active with rising edge, with
pull-up resistor, connect to ACK
27
BUSY
IN
Printer is busy, high-level active, with pull-up resistor, connect
to BUSY
4.5.Parallel mode pins
341A
Pin No.
Pin Name
Pin Type
Pin Description
22~15
D7~D0
Bi-directional
tri-state
8-bit bi-directional data bus, with pull-up resistor
EPP mode: indicate write operation, write with low-level,
read with high-level
25
WR#
OUT
MEM mode: write strobe output WR#, low-level active
EPP mode: data operation select, low-level active
4
DS#
OUT
MEM mode: read strobe output RD#, low-level active
26
RST#
OUT
Reset output, low-level active
EPP mode: address operation strobe, low-level active
3
AS#
Tri-state
Output
MEM mode: address wire output ADDR or A0
27
WAIT#
IN
CH341A: request to wait, low-level active, with pull-up
resistor
7
INT#
IN
Interrupt request input, active with rising edge, with
pull-up resistor
5
ERR#
IN
Self-define common input, with pull-up resistor
8
SLCT
IN
Self-define common input, with pull-up resistor
6
PEMP
IN
Self-define common input, with pull-up resistor
4.6.Synchronous serial interface pins
Pin No.
341A
341H
Pin Name
Pin Type
Pin Description
22
17
DIN
IN
4-wire serial data input, with pull-up resistor
21
16
DIN2
IN
5-wire serial data input 2,with pull-up resistor
20
15
DOUT
Tri-state
Output
4-wire serial data output, other name is MOSI or SDO
19
14
DOUT2
Tri-state
5-wire serial data output 2


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