at85c51snd3 ATMEL Corporation, at85c51snd3 Datasheet - Page 33

• Manufacturer Part Number: at85c51snd3
• Description: At85c51snd3 Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

SIO Clock Generator
7632D–MP3–01/07
Table 28. MMC Clock Selection
Table 29. MMC Clock Divider
As detailed in Figure 23, the SIO clock which feeds the internal SIO baud rate generator
can be programmed using SIOCKS bit in CKSEL register according to Table 30 to gen-
erate either the oscillator frequency or a very high frequency allowing very high baud
rate when PLL is enabled. SIO clock is enabled by SIOCKEN bit in CKEN register.
Figure 23. SIO Clock Generator Block Diagram and Symbol
Table 30. SIO Clock Selection
MMCCKS2:0
MMCDIV4:0
SIOCKS
≥ 00001
00000
000
001
010
100
101
011
110
111
0
1
CLOCK
GEN
Clock Selection (F
F
60 MHz
48 MHz
30 MHz
24 MHz
20 MHz
16 MHz
F
Clock Division
Disabled (no clock out)
F
Clock Selection (F
F
120 MHz
OSC
OSC
MMC
OSC
120 MHz
(default)
÷
= F
OSC
2
S
÷
MMCDIV
SIOCKS
CKSEL.2
S
S
)
)
0
1
F
S
SIOCKEN
CKEN.1
SIO Clock Symbol
CLOCK
SIO
SIO Clock
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