M16C6K9 Datasheet, PDF (166/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
LPC Bus Interface
Sequence 4 (re-trigger)
LPC communication
GateA20 pin
IBF0 flag refresh
IBF interrupt request
Write D1
to 006416
Write D1
to 006416
Previous value
No
No
No
No
Write data
to 006016
Bit 1 value of the data
No
No
Sequence 5 (cancel operation)
LPC communication
GateA20 pin
IBF0 flag refresh
IBF interrupt request
Write D1
to 006416
Previous value
No
No
Write data
other than
D1 to 006416
Yes
Yes
Sequence 6 (continuance operation)
LPC communication
GateA20 pin
IBF0 flag refresh
IBF interrupt request
Write D1
to 006416
Previous value
No
No
Write data1
to 006016
Write D1
to 006416
Bit 1 value of the data
No
No
No
No
Write data2
to 006016
The value of bit 1 of data 2
No
No
Fig.GF-12 GateA20 operation sequence (2)
Rev.1.00 Jun 06, 2003 page 166 of 290