Dataclk Baud Rate Selection; Active Address Decoder Output For Crubit,12-15 - Texas Instruments 990 Maintenance Manual

~,o-------
~
945408-9701
OSCLK
- - - - - - - - f l . . . , K
L
(A)l 33019
CRUBIT ,12-15
1000
1001
1010
1011
1100
1101
1110,
1111
QC
QB
QA
CQ
QD
75/11 0
QC
QB
300
QA
Q D I - - - - -
rEZ ___
i
QC 1----~
.__~·__;E
3;.n
I
QB
QA
IE4
I
L----~---t--0 E~-~~
IE5~
I
l
__.r---L_
1200
2400
4800
L----------+:E~6~
I
9600
L---------41E_7~ l
L----.J
JUMPERS
Figure 4-2. Baud Rate Clock Logic Diagram
Table 4-1. DATACLK Baud Rate Selection
From To Baud Rate
E2
110
E21 connected to E22
E2 75
E3 300
El E4
1200
ES
2400
E21 connected to E20
E6 4800
E7
9600
Table 4-2. Active Address Decoder Output for CRUBIT,12-15
Active (ADDS,9-15)-
Action
ADDS9-
Sets data terminal ready latch according to
CRUDAT AOUT-.
ADDSlO-
Sets request to send latch according to CRUDATAOUT-.
ADDSll-
Sets vyrite request flag if data terminal ready flag reset
and transmit bit counter active.
ADDS12-
Resets read request flag and timing error flag.
ADDS13-
Resets new status flag.
ADDS14-
Sets interrupt mask latch according to CRUDATAOUT-.
ADDS15-
Sets diagnostic mode latch according to CRUDATAOUT-.
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Digital Systems Division