IA6850 Datasheet, PDF (2/4 Pages) InnovASIC, Inc – Asynchronous Communications Interface Adapter (ACIA)

IA6850
Page 2 of 4
Advanced Information Sheet
Asynchronous Communications Interface Adapter (ACIA)
The IA6850 is an ACIA megafunction used to interface a microprocessor to a serial communications
channel, and is functionally equivalent to the Motorola MC6850. This function receives and transmits
data in a variety of configurations including 7 or 8 bit data words, odd, even, or nor parity, and 1 or 2
stop bits.
A block diagram is shown in Figure 1.
Functional Block Diagram
Figure 1
TXCLK
CLOCK
GEN
PARITY
GEN
R/W_n
CS0
CS1
CS2_n
RS
E
CHIP
SELECT
AND
READ/WRITE
CONTROL
D0
D1
D2
D3
DATA
BUS
D4
BUFFERS
D5
D6
D7
TRANSMIT
DATA
REGISTER
STATUS
REGISTER
CONTROL
REGISTER
TRANSMIT
SHIFT
REGISTER
TXDATA
TRANSMIT
CONTROL
CTS_n
INTERRUPT
LOGIC
IRQ_n
DCD_n
RTS_n
RECEIVE
CONTROL
PARITY
CHECK
RXCLK
RECEIVE
DATA
REGISTER
RECEIVE
SHIFT
REGISTER
CLOCK
GEN
SYNC
LOGIC
RXDATA
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