st2032a Sitronix Technology Corporation, st2032a Datasheet - Page 29

• Manufacturer Part Number: st2032a
• Description: 8 Bit Microcontroller With 32k Bytes Rom
• Manufacturer: Sitronix Technology Corporation

14.2 Sample Rate Control
PSG1L and PSG1H control the sample rate. PSG1[11~6]
controls PWM repeat times (usually set=111100 for four
times of DAC reload) and PSG1[5~0] usually set ‘ 1’ . The
Ver 2.4
DAC Interrupt Frequency
PSG1[11~0]
DAC[7~0]
16K
8K
PSGCK
DMD[0]
DMD[1]
DACE
PSGC[6~4]
INH
OSCX
RC
Sample Rate Generator
CK_IN
Enable
PSG1[11~0]
TABLE 14-4 DAC Sample Rate Description (RC
IN0
IN1
PSG Selector
Output
PWM Frequency
Select
FIGURE 14-2 DAC Clock Source Control
32K
32K
Output
FIGURE 14-1 DAC Diagram
Fs
PSGCK
DAC[7~0]
DMD[0]
DMD[1]
Fs
Enable
PWM Generator
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input clock source is controlled by PCK[2~0]. The block
diagram is shown as the following:
Reload_DAC
PSGC B6, B5, B4
POB
PO
B6
X
X
0
0
1
100
100
PSGC
B5
OSC
0
0
1
1
0
= 2MHz)
B4
0
1
0
1
0
SYSCK/2
SYSCK/4
SYSCK
SYSCK/8
SYSCK x 2
PSGCK
00001111, 00111111
00001111, 10111111
BD
BDB
Reload_DAC
PSG1H, PSG1L
ST2032A
9/13/07