NEC VR4181 mPD30181 User Manual page 251

Bit Name
5, 4 GP18MD(1:0)
3, 2 GP17MD(1:0)
1, 0 GP16MD(1:0)
CHAPTER 13 GENERAL PURPOSE I/O UNIT (GIU)
These bits control direction and function of the GPIO18 pin as follows:
00 : General-purpose input
01 : IORDY input
10 : General-purpose output
11 : RFU
These bits control direction and function of the GPIO17 pin as follows:
00 : General-purpose input
01 : RFU
10 : General-purpose output
11 : IOWR# output
These bits control direction and function of the GPIO16 pin as follows:
00 : General-purpose input
01 : RFU
10 : General-purpose output
11 : IORD# output
User's Manual U14272EJ3V0UM
Function
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