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UMC - Asynchronous Communication Interface Adapter

Numéro de référence UM6551A
Description Asynchronous Communication Interface Adapter
Fabricant UMC 
Logo UMC 





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UM6551A fiche technique
(DUMO
UM6551 / UM6551A
.!,.i.:i;::;t'1~?:t;if~I;);fQ'0~0i~:~::;':':Ji:il~'i:!f!:,:t!:P?:1'i:;i7(ij~~jr~iil{t!~ti!!~tf01;iz;11:;;ji::~;JrJ~Y%;;~i:1~~j,I!~ Asynchronous Communication
Interface Adapter
Features
• On-chip baud rate generator: 15 programmable baud
rates derived from a standard 1.8432 MHz external
crystal (50 to 19,200 baud)
• Programmable interrupt and status register to simplify
software design
• Single +5 volt power supply
• Serial echo mode
• False start b it detect io n
• 8-bit bi-directional data bus for direct communica-
tion with the microprocessor
• External 16x clock input for non-standard baud rates
(up to 125k baud)
• Programmable: word lengths; number of stop bits;
and parity bit generation and detection
• Data set and modem control signals provided
• Parity: (odd, even, none, mark, space)
• Full-duplex or half-duplex operation
• 5,6,7,8, and 9 bit transmission
General Description
The UM6551 is an Asynchronous Communication Adapter
(ACIA) intended to provide for interfacing the 6500/6800
microprocessor families to serial communication data
sets and modems. A unique feature is the inclusion of an
on-chip programmable baud rate generator, with a crystal
being the only external component required.
Pin Configuration
Block Diagram
GND
CSo
CS)
RES
RxC
XTALl
XTAL2
RTS
CTS
TxD
DTR
RxD
RSo
RS)
R/W
1>2
TAO
DB7
DB6
DBs
DB4
DB3
DB2
DB)
DBo
DSR
DCD
VCC
¢2
R/W
~o
CSI
RSo
§
RES
DBo
DB7
CTS
TxD
'iFi'Q
DCD
DSR
RxC
XTALl
XTAL2
RxD
DTR
RTS
7-87

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