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參數(shù)資料
| 型號： | HT82A851R |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | USB Audio MCU |
| 中文描述： | USB音頻控制器 |
| 文件頁數(shù)： | 22/43頁 |
| 文件大?。?/td> | 304K |
| 代理商： | HT82A851R |
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HT82A851R
Rev. 1.20
22
June 15, 2007
Writing to RECORD_IN_L register will only put the written data to an internal lower-order byte buffer (8-bit) and writing
RECORD_IN _H will transfer the RECORD_IN _L and RECORD_IN_H registers content to isochronous in buffer.
When record interrupt happened, firmware should write 16-bit 2 s complement value to RECORD_IN_L and RE-
CORD_IN_H registers.
PFD Control
Label
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PFDC
0
PRES1
PRES0
PFDEN
0
0
PFD_IO
Reserved
PFDD
PFDD7
PFDD6
PFDD5
PFDD4
PFDD3
PFDD2
PFDD1
PFDD0
The PFD (programmable frequency divider) is implemented in the HT82A851R. It is composed of two portions: a
prescaler and a general counter.
Theprescaleriscontrolledbytheregisterbits,PRES0andPRES1.The4-stageprescalerisdividedby16.Thegeneral
counter is programmed by an 8-bit register PFDD.
The PFDD is inhibited to write while the PFD is disabled. To modify the PFDD contents, the PFD must be enabled.
When the generator is disabled, the PFDD is cleared by hardware.
PFD prescaler selection:
PRES1
PRES0
Prescaler Output
0
0
PFD frequency source
1
0
1
PFD frequency source
2
1
0
PFD frequency source
4
1
1
PFD frequency source
8
The bit PFD_IO is used to determine whether PC0 is a general purpose I/O port or a PFD output.
Label
Functions
PFD_IO=1
PC0 is PFD output
PFD_IO=0
PC0 is a general purpose IO Port (Default =0)
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