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DEC VT220 - Page 210

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ACR
ADDRESS
B7F4H(WR)
06
05
04
03
02
01
00
BAUD
COUNTER/TIMER
DELTA
DELTA
DELTA
DELTA
SET
MODE AND SOURCE
IP3 IP2
IPl
IPO
SEL
I I
INT
INT
INT
IN
IT
IBAD7
H}
..
41--------------------~
.....
(BADO HI
BIT VALUES
BiT 7
0
1
BiT
4-€
000
001
010
011
100
101
110
1"
BiT 3
0
1
BIT 2
0
1
BIT
1
0
1
BIT 0
0
1
Figure
C-8
SELECT
BAUD
RATE
SET
1
SELECT
BAUD
RA
TE
SET
2
COUNTER MODE - EXTERNAL (IP2) SOURCE
COUNTER MODE - TxCA AT
1X CLOCK
OF
CHANNEL A Tx
COUNTER MODE -
T.CB
AT
lX
CLOCK
OF
CHANNEL B
T,
COUNTER MODE - CRYSTAL
OR
EXTERNAL
CLOCK
(CLKI DIVIDED
BY
16
TIMER MODE - EXTERNAL (lP2) SOURCE
TIMER MODE - EXTERNAL
(IP21
SOURCE
DIVIDED
BY
16
TIMER MODE - CRYSTAL
OR
EXTERNAL
(ClK!
SOURCE
TIMER MODE - CRYSTAL
OR
EXTERNAL
(ClK)
SOURCE DIVIDED
BY
16
NO
INTERRUPT ON CHANGE
OF
STATE
SET ISR BIT 7 ON
DETECT
OF
CHANGE
OF
STATE AT IP3
NO INTERRUPT
ON
CHANGE
OF
STATE
SET
ISR BIT 7 ON DETECT
OF
CHANGE
OF
STATE
AT
IP2
NO
INTERRUPT
ON
CHANGE
OF
STATE
SET
ISR BIT 7
ON
DETECT
OF
CHANGE
OF
STATE AT
IPl
NO
INTERRUPT ON CHANGE
OF
STATE
SET
ISR BIT 7
ON
DETECT
OF
CHANGE
OF
STATE
AT
IPO
2681
DUART:
Auxiliary
Control
Register
(ACR)
C-7

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