Datasheet

Rev. 3.00, 03/04, page 576 of 830
Table 16.7 Fast A20 Gate Output Signals
C/D1 Data/Command
Internal CPU
Interrupt Flag
(IBF)
GA20
(PD3) Remarks
1 H'D1 command 0 Q Turn-on sequence
0 1 data*
1
0 1
1 H'FF command 0 Q (1)
1 H'D1 command 0 Q Turn-off sequence
0 0 data*
2
0 0
1 H'FF command 0 Q (0)
1 H'D1 command 0 Q Turn-on sequence
0 1 data*
1
0 1 (abbreviated form)
1/0 Command other than H
′FF and
H'D1
1 Q (1)
1 H'D1 command 0 Q Turn-off sequence
0 0 data*
2
0 0 (abbreviated form)
1/0 Command other than H
′FF and
H'D1
1 Q (0)
1
1
H'D1 command
Command other than H'D1
0
1
Q
Q
Cancelled sequence
1 H'D1 command 0 Q Retriggered sequence
1 H'D1 command 0 Q
1 H'D1 command 0 Q Consecutively executed
0 Any data 0 1/0 sequences
1 H'D1 command 0 Q (1/0)
Notes: 1. Arbitrary data with bit 1 set to 1.
2. Arbitrary data with bit 1 cleared to 0.