Cypress S6J3200 Series, Manual

Page: 449 / 1355

CHAPTER 18:Sound Generator
448 S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
[bit9] BUSY : Busy status bit
This bit is to indicate whether the Sound Generator is in operation or not.
This bit is only for read access, and the write access to this bit has no effect.
Bit
Description
Read
0
Sound Generator is inactive.
This bit is cleared under any of following conditions.
-
Software reset is set (SRST="1").
-
ST bit is cleared by writing "0".
And the operation is completed after 1 tone cycle (current tone cycle) has finished.
1
Sound Generator is active.
This bit is set when ST bit is written "1".
[bit8] Reserved : Reserved bit
Always write "0" to this bit. The read value is "0".
[bit7:6] S1, S0 : Operation clock select bits
The combination of these bits controls the internal clock division, to determine the bit rate on the output
sound.
S1 S0 Description
0 0 The division ratio at the Prescaler is 1.
0 1 The division ratio at the Prescaler is 2.
1 0 The division ratio at the Prescaler is 4.
1 1 The division ratio at the Prescaler is 8..
[bit5] TONE : Tone output bit
This bit controls the type of SGO output signal.
Bit Description
0 SGO outputs the mixed signal of tone pulse and PWM pulse.
1
SGO outputs a simple square wave (tone pulse), that is generated by the internal toggle
flip-flop.
[bit4] SGOOE : SGO signal output enable bit
This bit controls whether to enable the output of SGO.
Bit Description
0 SGO output is disabled.
1 SGO output is enabled.
[bit3] SGAOE : SGA signal output enable bit
This bit controls whether to enable the output of SGA.