Version 1.0

8-Bit Micro-Controller

www.raio.com.tw

8/11

RA8917

PT3_5

CAS#

I/O

Bit-5 of Port 3

This is a programmable pin for general-purpose I/O Port 3. The driving current

and pull-high or pull-low can be selected by user register.

The PT3_5 is also as the EDO RAM Column Address Strobe.

PT3_4

RAS#

I/O

Bit-4 of Port 3

This is a programmable pin for general-purpose I/O Port 3. The driving current

and pull-high or pull-low can be selected by user register.

The PT3_4 is also as the EDO RAM Row Address Strobe.

PT3_3

TX

I/O

Bit-3 of Port 3

The PT3_3 is also as the transmission output of user’s UART. In UART mode,

the pin is always output except the power saving mode.

PT3_2

RX

I/O

Bit-2 of Port 3

The PT3_2 is also as the receive input of user’s UART. In UART mode, the pin

is always input.

PT3_1

LCD_E

I/O

Bit-1 of Port 3

The PT3_1 is also as the chip enable of external LCD controller. If the external

LCD enabled, the pin is always output except the power saving mode.

PT3_0

LCD_RW

I/O

Bit-0 of Port 3

The PT3_0 is also as the read/write signal of external LCD controller. If the

external LCD enabled, the pin is always output except the power saving mode.

PT4_[7:0]

I/O

Bit 7~0 of Port 4

This is a programmable pin for general-purpose I/O Port 4. The driving current

and pull-high or pull-low can be selected by user register.

IOUT

OUT

DAC Current Output

This pin is the current output of DAC.

AIN[3:0]

IN

ADC Analog Input

These pins are the analog input of 12-bit ADC for 4-channel.

ADC Mode

Touch Panel Mode

AIN0

X1

AIN1

X2

AIN2

Y1

AIN3

Y2

SW[3:1]

OUT

Analog switch [3~1]

COM

IN

Common input voltage of switch [3~1]

A[13:0]

OUT

14-bit Address Bus.

These signal are used for external memory address bus.

D[7:0]

I/O

8-bit Data Bus.

These signal are used for external memory data bus.

FL_CE#

OUT

Flash Chip Select, active low.

This signal is used for external flash.

FL_WE#

OUT

Flash Write Enable, active low.

This signal is used for external flash.

If REG[1032h] bit6 is set as 1, and then FL_WE# and MEM_WE can be jointly

used.

FL_OE#

OUT

Flash Output Enable, active low.

This signal is used for external flash.

If REG[1032h] bit6 is set as 1，and then FL_OE# and MEM_OE# can be jointly

used.

BK[11:0]

OUT

Bank Bus.

Register FBANK[1030h], [105Ah] and Ext_SBANK [103Fh], [105Bh] jointly use

Bank[11:0] Bus as the output of memory bank register.

Normally, they are

connected to the higher address of external Flash memory.