INOVC IA6850-PDW24C, IA6850-PDW24I Datasheet
Page 1 of 4
IA6850 Advanced Information Sheet
Asynchronous Communications Interface Adapter (ACIA)
FEATURES
• Form, Fit, and Function Compatible with the Motorola MC6850
• Packaging option available: 24 Pin Plastic DIP
• Programmable Word Length, Stop Bits, and Parity
• Error Detection
• Divide by 1, 16, or 64 operation
• TBD Equivalent gates.
The IA6850 uses innovASIC’s innovative new f 3 Program to provide industry with parts that other
vendors have declared obsolete. By specifying parts through this program a customer is assured of
never having a component become obsolete again. This advanced information sheet assumes the
original part has been designed in, and so provides a summary of capabilities only. For new designs
contact innovASIC for more detailed information.
Motorola is a copyright trademark of Motorola, Inc.
VSS
RXDATA
RXCLK
TXCLK
RTS_n
TXDATA
IRQ_n
CS0
Package Pinout
(1)
(2)
24 Pin DIP
(3)
(4)
(5)
(6)
(7)
(8)
(9)CS2_n
(10)CS1
(11)RS
(12)VCC
IA6850
(24)
(23)
(22)
(21)
(20)
(19)
(18)
(17)
(16)
(15)
(14)
(13)
CTS_n
DCD_n
D0
D1
D2
D3
D4
D5
D6
D7
E
R/W_n
Copyright 1999, InnovASIC Inc.
Customer Specific IC Solutions
Page 2 of 4
IA6850 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
R/W_n
CS0
CS1
CS2_n
RS
E
D0
D1
D2
D3
D4
D5
D6
D7
CHIP
SELECT
AND
READ/WRITE
CONTROL
DATA
BUS
BUFFERS
TRANSMIT
DATA
REGISTER
STATUS
REGISTER
CONTROL
REGISTER
CLOCK
GEN
TRANSMIT
SHIFT
REGISTER
TRANSMIT
CONTROL
RECEIVE
CONTROL
PARITY
GEN
INTERRUPT
LOGIC
TXDATA
CTS_n
IRQ_n
DCD_n
RTS_n
PARITY
CHECK
RXCLK
RECEIVE
DATA
REGISTER
Copyright 1999, InnovASIC Inc.
Customer Specific IC Solutions
RECEIVE
SHIFT
REGISTER
CLOCK
GEN
RXDATA
SYNC
LOGIC
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