SNC15340

One Channel Speech Controller

Ver: 1.5

October 30

, 2008

4

4. Block Diagram

5. FUNCTION DESCRIPTIONS

5.1 Oscillator

SNC15340 accepts RC type oscillator for system clock. The typical circuit diagram for

oscillator is listed as follows.

!

5.2 ROM

SNC15340 contains a substantial 688K words (12-bit) internal ROM, which is shared

by program and resource data. Program, voice and data are shared within this same

688K words ROM.

OSC

VCC

RC Oscillator

ROM

Program/Speech

688K

×12 bits

OSC

Address Pointers/ STACK

Voice

Synthesizer

ALU

SRAM (128 nibbles)

Timer

PWM

Circuit

Timing

Generator

Sampling Rate Counter

IO port 5

IO port 2

IO port 1

Watch Dog

Timer

IO port 4