RA8875
Version 1.0
Character / Graphic TFT LCD Controller
5-4 Serial Flash / ROM Interface
Pin Name
SFCL
SFDI/SIO0
I/O
O
I/O
Pin Description
External Serial Flash/ROM Clock
Serial flash/ROM SPI I/F clock.
External Flash/ROM SPI Data Input
Single mode: Data input for serial flash/ROM SPI I/F.
Dual mode: The signal is used as bi-direction data #0(SIO0).
External Flash/ROM SPI Data Output
Single mode: Data output for serial flash/ROM SPI I/F.
Dual mode: The signal is used as bi-direction data #1(SIO1).
External Flash/ROM SPI Chip Select 0
Chip select pin for serial flash/ROM SPI I/F #0.
External Flash/ROM SPI Chip Select 1
Chip select pin for serial flash/ROM SPI I/F #1.
SFDO/SIO1
SFCS0#
SFCS1#
I/O
O
O
5-5 Touch Interface
Pin Name
YN
YP
XN
XP
ADC_VREF
I/O
A
A
A
A
A
Pin Description
YN Signal for Touch Panel
4-wire TP YN Control Signal.
YP Signal for Touch Panel
4-wire TP YP Control Signal.
XN Signal for Touch Panel
4-wire TP XN Control Signal.
XP Signal for Touch Panel
4-wire TP XP Control Signal.
TP ADC Reference Voltage
This pin is the reference voltage for ADC as 0.5 VDD. The reference
voltage could be generated by RA8875(default) or from external circuit.
5-6 KeySCAN Interface
Pin Name
KOUT[3:0]/
(GPO[3:0])
KIN[4:0]/
(GPI[4:0])
GPOX
GPIX
I
O
I/O
Pin Description
Keypad Strobe Line or GPOs(General Purpose Output)
Keypad matrix strobe lines outputs with open-drain. (Default).
They could be programmed as GPOs by register setting , if don’t use,
please keep floating.
Keypad Data Line or GPIs (General Purpose Input)
Keypad data inputs(Default), please add pull-up resister.
They could be programmed as GPIs by register setting, if don’t use,
please connect it to GND.
Extra GPO(General Purpose Output)
Additional GPO signal. if don’t use, please keep floating.
Extra GPI(General Purpose Input)
Additional GPI signal, if don’t use, please connect it to GND.
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