Version 1.0

8-Bit Micro-Controller

www.raio.com.tw

9/11

RA8917

RXD

IN

Receive Data

This is the received data input of system UART. Normally it’s connected to the

RS232’s TX of PC.

TXD

OUT

Transmit Data

This signal is the transmitted data output of system UART. Normally it’s

connected to the RS232’s RX of PC.

OSC1_XA

IN

Oscillator1 Input.

This is the input signal of external X’tal(32768Hz).

OSC1_XB

OUT

Oscillator1 Output.

This is the output signal of external X’tal(32768Hz).

OSC2_XA

IN

Oscillator2 Input.

This is the input signal of external X’tal. (maximum up to 22.1184MHz)

OSC2_XB

OUT

Oscillator2 Output.

This is the output signal of external X’tal. (maximum up to 22.1184MHz)

CKS[2:0]

IN

OSC2 Frequency Select

These input signals are used to select the OSC2 speed during the hardware

reset.

CKS2

CKS1

CKS0

OSC2 Clock

0

0

0

1.8432MHz

0

0

1

3.6864MHZ

0

1

0

5.5296MHz

0

1

1

7.3728MHz

1

0

0

11.0592MHz

1

0

1

14.7456MHz

1

1

0

18.432MHz

1

1

1

22.1184MHz

Note: Couldn’t be floating.

TYPE

IN

Clock Type Select for 32768Hz

0: RC Oscillator

1: 32768 X’tal

Note: Couldn’t be floating.

VEXT

IN

Low Voltage Detector Input

TEST[2:0]#

IN

Test Pins

Test Pins are for RAiO’s internal testing purpose used in testing IC and ROM

status.

Normally, users will not use these pins.

Therefore, please connect

these three pins to VDD when making PCB board.

VDD

PWR

Power Supply Voltage of Chip Core.

VDDP

PWR

Power Supply Voltage of Chip I/O.

AVDD

PWR

Analog Power Supply Voltage.

GND

PWR

Ground of Chip Core.

GNDP

PWR

Ground of Chip I/O.

AGND

PWR

Analog Ground.