W561XXX

- 4 -

BLOCK DIAGRAM

I/O

Controller

TrueMelody

Generator

RAM

Special Register

Timing

Generator

OSCI

OSCO

P0 P1 P2 P3

Synthesizer II

Synthesizer I

ALU

Timer

ROM

Timbre

Table

DAC1

DAC2

OSCSEL

PAD DESCRIPTION

PARAMETER

I/O

DESCRIPTION

TEST

I

Test pin, internally pulled low

P0.0

−P0.3

I

Interruptable input pins, internally pulled high.

P1.0

−P1.3

I/O

I/O multiplexed port 1. The port 1 is interruptable, if selected as input

pins

P2.0

−P2.3

I/O

I/O multiplexed port 2.

P3.0

−P3.3

O

Output port 3.

-

Negative power supply.

RESET

I

Reset all, functions as POR (Power On Reset), internally pulled high.

-

Positive power supply.

OSCI

I

OSCO

O

the 3 MHz master frequency.

DAC1

O

Current output of channel 1 for driving an external speaker

DAC2

O

Current output of channel 2 for driving an external speaker

OSCSEL

I

select Crystal type, connect to GND to select ring oscillator type.