3.2
Noise Generator
CONTROL
(Register
R6)
The frequency of the noise source is obtained in the PSG by first
counting down the input clock by 16, then by further counting down
the result by the programmed 5-bit Noise Period value. This B-bit
value consists of the lower 5 bits (B4-B0) of register R6, as
illustrated in the following:
Noise Period
Register R6
Note that the 6-bit value in R11 is a period value-the higher the value
in the register, the lower the resultant noise frequency. Note also that,
as with the Tone Period, the lowest period value is00001 (divide by 1);
the highest period value is 11111 (divide by 31
10
).
The noise frequency equation is:
Mix
To Next Page
Loading...