NEC VR4181 mPD30181 User Manual page 249

Bit Name
5, 4 GP10MD(1:0)
3, 2 GP9MD(1:0)
1, 0 GP8MD(1:0)
CHAPTER 13 GENERAL PURPOSE I/O UNIT (GIU)
These bits control direction and function of the GPIO10 pin as follows:
00 : General-purpose input
01 : CSI FRM input
10 : General-purpose output
11 : SYSCLK output
These bits control direction and function of the GPIO9 pin as follows:
00 : General-purpose input
01 : SIU2 CTS2# input
10 : General-purpose output
11 : RFU
These bits control direction and function of the GPIO8 pin as follows:
00 : General-purpose input
01 : SIU2 DSR2# input
10 : General-purpose output
11 : RFU
User's Manual U14272EJ3V0UM
Function
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