Table of Contents
Advertisement
Table 15.4
Fast A20 Gate Output Signals
HA0
Data/Command
1
H'D1 command
1
0
1 data*
1
H'FF command
1
H'D1 command
2
0
0 data*
1
H'FF command
1
H'D1 command
1
0
1 data*
1/0
Command other than H'FF and H'D1
1
H'D1 command
2
0
0 data*
1/0
Command other than H'FF and H'D1
1
H'D1 command
1
Command other than H'D1
1
H'D1 command
1
H'D1 command
1
H'D1 command
0
Any data
1
H'D1 command
Notes: 1. Arbitrary data with bit 1 set to 1.
2. Arbitrary data with bit 1 cleared to 0.
Rev. 1.00, 05/04, page 400 of 544
Internal CPU
Interrupt Flag
GA20
(IBF)
(P81)
0
Q
0
1
0
Q (1)
0
Q
0
0
0
Q (0)
0
Q
0
1
1
Q (1)
0
Q
0
0
1
Q (0)
0
Q
1
Q
0
Q
0
Q
0
Q
0
1/0
0
Q (1/0)
Remarks
Turn-on sequence
Turn-off sequence
Turn-on sequence
(abbreviated form)
Turn-off sequence
(abbreviated form)
Cancelled sequence
Retriggered
sequence
Consecutively
executed sequences
Advertisement
Table of Contents
