Microchip Technology ay-3-8910 - User Manual

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30-OCT-1999
This is the General Instruments AY-3-8910 / 8912
Programmable Sound Generator (PSG) data Manual.
This was scanned and converted using adobe capture
and adobe acrobat to convert it into a .pdf.
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Page 1

Microchip Technology ay-3-8910 Specifications

General

Model	AY-3-8910
Number of Channels	3
Envelope Generator	Yes
Noise Generator	Yes
Package	40-pin DIP
Manufacturer	Microchip Technology
Category	Sound Generator
I/O Ports	2 (8-bit)
Voltage Supply	5V

Summary

2 ARCHITECTURE

Register Array

Details the array of 16 read/write control registers and address decoding.

Sound Generating Blocks

Explains the basic blocks within the PSG responsible for sound generation.

I;O Ports

Describes the two general purpose I/O Ports for interfacing with external devices.

Pin Assignments

Details the pin assignments for the AY-3-8910 (40-pin) and AY-3-8912 (28-pin) packages.

Data;Address Bus

Defines the 8-bit bidirectional bus for data and address transfer between PSG and microprocessor.

Reset Pin

Describes the RESET input pin function for initialization and power-on purposes.

Bus Control Signals

Explains the BDIR, BC2, and BCI bus control signals generated by the microprocessor.

Parallel I;O Ports

Bus Timing

State Timing

3 OPERATION

Tone Generator Control

Explains how to control the frequency of the three tone generators using Coarse and Fine Tune registers.

Noise Generator Control

Details how to set the noise period using register R6 to control noise frequency.

Mixer Control & I;O Enable

Explains the multi-function Register R7 for controlling mixers and I/O port direction.

Amplitude Control

Describes how to set channel amplitudes using registers R10, R11, R12, including fixed and variable modes.

Envelope Generator Control

Details controlling the envelope generator's frequency and shape using registers R13, R14, and R15.

Envelope Period Control

Details setting the envelope frequency using Coarse and Fine Tune registers.

Envelope Shape;Cycle Control

Explains controlling envelope shape and cycle patterns using Register R15.

I;O Port Data Store

D;A Converter Operation

Details the logarithmic D/A conversion process and its role in sound amplitude control.

4 INTERFACING

Clock Generation

Audio Output Interface

Microprocessor;Microcomputer Interface

Details the bus lines and control signals connecting the AY-3-8910/8912 to a microprocessor/microcomputer.

Interfacing to the PIC 1650

Interfacing to the CP1600;1610

Interfacing to the M6800

Interfacing to the 8080 S100 Bus

5 MUSIC GENERATION

Note Generation

Explains how notes are formed by frequency and amplitude, and how register loads generate them.

Sound VARIATION

Covers channel volume, decay, and other sound modification effects.

Applications

Organ Envelope Generation

Organ Rhythm Generation

6 SOUND EFFECTS GENERATION

Tone Only Effects

Noise Only Effects

7 ELECTRICAL SPECIFICATIONS

Maximum Ratings

Specifies storage, operating temperatures, and maximum voltage ratings for the PSG.

Standard Operating Conditions

DC Characteristics

AC Characteristics

Details AC electrical characteristics, including clock, bus signals, and timing parameters.