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DEC VT220 - Page 212

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CTUR ADDRESS
CTLR ADDRESS
07
06
87F6H
(RD)/87F6H
(WRI
87F7H
(RDi/87F7H
(WR)
05 04 03
02
01
00
IBAD7
HI
....
I-------------------
....
(BADO
HI
BIT VALUES
BIT
0-7
lEAST
SIGNIFICANT
BYTE
OF
COUNTER
OR
TIMER MODE
(CTlRI
MOST SIGNIFICANT
BYTE
OF
COUNTER
OR
TIMER MODE
(CTURI
Figure
C-11
2681
DUART:
Counter
Timer/Upper
(CTUR)
and Lower
(CTLR)
Registers
IPR
ADDRESS
07
06
87FDH (RD)
05
04
03
02
01
00
I
I I
I
NOT
I
IP6
IPS
IP4
IP3 IP2
IPl
IPC
USED
j
I
IBAD7 HI
.....
I-------------------
....
IBADO
HI
BIT
VALUES
BIT
6
011
Bn
5
0/1
BIT 4
011
BIT 3
0;1
BIT 2
0/1
BIT 1
011
BIT 0
On
Figure
C-12
INOT USEDI
CURRENT STATE
OF
IPS
!DTR
DSR!
CURRENT STATE
OF
IP4
ITBlKi
CURRENT STATE
OF
IP3 ITVBI
CURRENT STATE
OF
IP2 (SPD INDI
CURRENT STATE
OF
IPl
IDSR)
CURRENT STATE
OF
IPC
(CTSi
2681
DUART:
Input
Port
Register
(IPR)
C-9

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