com81c17 Standard Microsystems Corp., com81c17 Datasheet - Page 4
com81c17
Manufacturer Part Number
com81c17
Description
Twenty Pin Uart Tpuart Corporation
Manufacturer
Standard Microsystems Corp.
Datasheet
1.COM81C17.pdf
(18 pages)
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D0-D7
nCS
nRD
nWR
RS
VCC
GND
nINT
1800 OHM
220 OHM
7404
FIGURE 2A – 5.0688 MHz CRYSTAL OSCILLATOR CIRCUIT
REGISTER
CONTROL
REGISTER
& LOGIC
MASK
TRANS
DATA
DECODE
BUS
READ
WRITE
LOGIC
FIGURE 2 – COM81C17 BLOCK DIAGRAM
220 OHM
30 pF
5.0688 MHz
7404
REGISTER
REGISTER
STATUS
560 OHM
4
MODE
REGISTER
SELECT
BAUD
RATE
SHIFT REGISTER
SHIFT REGISTER
TRANSMIT
TRANSMIT
TRANSMIT
CONTROL
7404
BUFFER
RECEIVE
CONTROL
GENERATOR
RECEIVE
BUFFER
RECEIVE
BAUD
RATE
7404
TX
CLOCK
RX