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CHAPTER 25 SOUND GENERATOR
25.1
Outline of Sound Generator
The Sound Generator consists of the Sound Control register, Frequency Data register,
Amplitude Data register, Decrement Grade register, Tone Count register, PWM pulse
generator, Frequency counter, Decrement counter and Tone Pulse counter.
■ Block Diagram of Sound Generator
Figure 25.1-1 shows a block diagram of the sound generator.
Clock input
Prescaler
S1
S0
534
Figure 25.1-1 Block Diagram of Sound Generator
8bit PWM pulse
Generator
CO
EN
PWM
reload
Amplitude Data
register
DEC
Decrement
Counter
CI
CO
EN
Decrement Grade
register
Tone Pulse
Counter
CI
CO
EN
Tone Count
register
Frequency
Counter
CI
CO
EN
reload
Frequency Data
Register
DEC
Mix
TONE
INTE
INT
ST
Toggle
Flip-flop
D
Q
EN
1/d
SGA
OE1
OE1
SGO
OE2
OE2
IRQ
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