HD64F2149 Datasheet, PDF (641/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Table 18B.3 GA20 (P81) Set/Clear Timing
Pin Name
GA20 (P81)
Setting Condition
When bit 1 of the written data is 1 and
data follows an H'D1 host command
Clearing Condition
When bit 1 of the written data is 0 and
the data follows an H'D1 host command
Start
Host write
No
H'D1 command
received?
Yes
Wait for next byte
Host write
No
Data byte?
Yes
Write bit 1 of data byte
to DR bit of P81/GA20
Figure 18B.4 GA20 Output
607