NEC uPD98502 - page 196

CHAPTER 3 SYSTEM CONTROLLER
196 Preliminary User’s Manual S15543EJ1V0UM
3.2.9 S_IOR (IO Port Register)
The IO port register “S_IOR” is a read-write and 32-bit word-aligned register. IO port register is used to indicate the
status of software. Each bit of the following POM_OUT fields is connected to the external IO port (POM[7:0]) directly.
S_IOR is initialized to 0 at reset and contains the following fields:
Bits Field R/W Default Description
31:8 Reserved R/W 0 Hardwired to 0.
7 POM_OUT7 R/W 0 Set output level for POM7 pin:
0 = deassert POM7.
1 = assert POM7.
6 POM_OUT6 R/W 0 Set output level for POM6 pin:
0 = deassert POM6.
1 = assert POM6.
5 POM_OUT5 R/W 0 Set output level for POM5 pin:
0 = deassert POM5.
1 = assert POM5.
4 POM_OUT4 R/W 0 Set output level for POM4 pin:
0 = deassert POM4.
1 = assert POM4.
3 POM_OUT3 R/W 0 Set output level for POM3 pin:
0 = deassert POM3.
1 = assert POM3.
2 POM_OUT2 R/W 0 Set output level for POM2 pin:
0 = deassert POM2.
1 = assert POM2.
1 POM_OUT1 R/W 0 Set output level for POM1 pin:
0 = deassert POM1.
1 = assert POM1.
0 POM_OUT0 R/W 0 Set output level for POM0 pin:
0 = deassert POM0.
1 = assert POM0.