UPD30181 Datasheet, PDF (236/444 Pages) NEC – 64-/32-Bit Microprocessor

CHAPTER 13 GENERAL PURPOSE I/O UNIT (GIU)
13.1 Overview
13.1.1 GPIO pins and alternate functions
The VR4181 provides 32 general-purpose I/O divided into two groups of 16 pins each. The first group, GPIO(15:0)
pins, are capable of supporting the following types of functions:
• Clocked serial interface (CSI)
• Serial interface channel 2
• Color LCD interface (upper 4-bit data) or CompactFlash Card Detect inputs
• General-purpose outputs
• Interrupt/wake-up inputs
• Programmable chip selects
• External ISA system clock output
Any of GPIO(15:0) pins can be used as interrupt/wake-up inputs.
The assignment of interface signals to particular GPIO pins is shown in the following table:
Table 13-1. Alternate Functions of GPIO(15:0) Pins
GPIO pin
GPIO15
GPIO14
GPIO13
GPIO12
GPIO11
GPIO10
GPIO9
GPIO8
GPIO7
GPIO6
GPIO5
GPIO4
GPIO3
GPIO2
GPIO1
GPIO0
Alternate signal
1
FPD7
FPD6
FPD5
FPD4
PCS1#
FRM
CTS2#
DSR2#
DTR2#
RTS2#
DCD2#
−
PCS0#
SCK
SO
SI
Alternate signal
2
CD2#
CD1#
−
−
−
SYSCLK
−
−
−
−
−
−
−
−
−
−
Definition
Color LCD data bit output or Card Detect 2 input
Color LCD data bit output or Card Detect 1 input
Color LCD data bit output
Color LCD data bit output
Programmable chip select 1 output.
CSI FRM input or SYSCLK output
SIU2 CTS input
SIU2 DSR input
SIU2 DTR output
SIU2 RTS output
SIU2 DCD input
−
Programmable chip select 0 output.
CSI serial clock input
CSI serial data output
CSI serial data input
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User’s Manual U14272EJ3V0UM