Version 1.0

8-Bit Micro-Controller

www.raio.com.tw

7/11

RA8917

PT2_6

PWM2

I/O

Bit-6 of Port 2

This is a programmable pin for general-purpose I/O Port 2. The driving current

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

The PT2_6 is also as the output of PWM2. In PWM mode, the pin is always

output and 72mA-driving current is selected.

PT2_5

EXP_WR#

I/O

Bit-5 of Port 2

This is a programmable pin for general-purpose I/O Port 2. The driving current

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

The PT2_5 is also as the write control of register $101E. If the write register

$101F enabled, the pin is always output except the power saving mode.

PT2_4

FL_CE2#

I/O

Bit-4 of Port 2

This is a programmable pin for general-purpose I/O Port 2. The driving current

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

The PT2_4 is also as the secondary external flash chip select. If the secondary

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

PT2_3

LVD_#

I/O

Bit-3 of Port 2

This is a programmable pin for general-purpose I/O Port 2. The driving current

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

The PT2_3 is also as the output of LVD. If the LVD enabled, the pin is always

output except the power saving mode.

PT2_2

MEM_WE#

I/O

Bit-2 of Port 2

This is a programmable pin for general-purpose I/O Port 2. The driving current

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

The PT2_2 is also as the external memory write enable. If the external memory

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

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

used.

PT2_1

MEM_OE#

I/O

Bit-1 of Port 2

This is a programmable pin for general-purpose I/O Port 2. The driving current

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

The PT2_1 is also as the external memory output enabling. If the external

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

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

used.

PT2_0

MEM_CE#

I/O

Bit-0 of Port 2

This is a programmable pin for general-purpose I/O Port 2. The driving current

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

The PT2_0 is also as the external memory chip selecting. If the external

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

PT3_7

EDO_OE#

I/O

Bit-7 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_7 is also as the EDO RAM data output enable.

PT3_6

EDO_WE#

I/O

Bit-6 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_6 is also as the EDO RAM Read/Write input.