W536020K/030K/060K/090K/120K

Publication Release Date: May 21, 2003

- 7 -

Revision A3

PAD Description, continued

SYMBOL

I/O

FUNCTION

RES

I

System reset pad, active low with internal pull-high resistor.

TEST

I

Test pad. Active high with internal pull low resistor.

ROSC

I

clock source.

PWM1/DAC

O

While speech or melody is active, PWM1/DAC is speaker direct driving

output or DAC output controlled by voice output file.

PWM2

O

While speech or melody is active, PWM2 is another speaker direct

driving output.

ADDR (5)

O

External serial memory address write clock for voice extension

(W536120K only).

CLK (5)

O

External serial memory address read clock for voice extension.

(W536120K only).

DATA (5)

I/O

External serial memory data in/out for voice extension (W536120K

only).

SEG0

−SEG15

O

Dedicated LCD segment output pads.

SEG16/PORTN.0



SEG19/PORTN.3

O/O

LCD segment output pads, and can be shared as general output by

register LCDM3 bit 1. Default function is segment pad.

SEG20/PORTM.0



SEG23/PORTM.3

O/I

LCD segment output pads, and can be shared as general input by

register LCDM3 bit 0. Default function is segment pad and PM5.1=0 to

inhibit LCD waveform abnormal.

SEG24/PORTL.0



SEG27/PORTL.3

O/O

LCD segment output pads, and can be shared as general output by

register LCDM2 bit 3. Default function is segment pad.

SEG28/PORTK.0



SEG31/PORTK.3

O/I

LCD segment output pads, and can be shared as general input by

register LCDM2 bit 2. Default function is segment pad and PM5.0=0 to

inhibit LCD waveform abnormal.

SEG32/PORTJ.0



SEG35/PORTJ.3

O/IO

LCD segment output pads, and can be shared as general input/output

by register LCDM2 bit 1. PM4 register is used to select input or output

while shared I/O function is active. Default function is segment pad and

PM4.3 = 0 to inhibit LCD waveform abnormal.

SEG36/PORTI.0



SEG39/PORTI.3

O/IO

LCD segment output pads, and can be shared as general input/output

by register LCDM2 bit 0. PM4 register is used to select input or output

while shared I/O function is active. Default function is segment pad and

PM4.2 = 0 to inhibit LCD waveform abnormal.