參數(shù)資料
型號(hào)： HT82A821R_07
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)： 20/39頁
文件大?。?/td> 275K
代理商： HT82A821R_07
HT82A821R
Rev. 1.10
20
June 29, 2007
DAC_Limit_Land DAC_Limit_H are used to define the 16-bit DAC output limit. DAC_Limit_Land DAC_Limit_H are un-
signed value. If the 16-bit data from Host over the range defined by DAC_Limit_L and DAC_Limit_H, the output digital
code to DAC will be clamp.
DAC_Limit_L
DAC output limit low byte
DAC_Limit_H
DAC output limit high byte
Setting DAC output limit value example:
;-----------------------------------------------------------
; DAC Limit POR Value=8000H
; Set DAC Limit Value=FF00H
;-----------------------------------------------------------
clr
[02DH]
; Set DAC Limit low byte=00H
set
[02EH]
; Set DAC Limit high byte=FFH
;-----------------------------------------------------------
In order to prevent the pop noise of speaker output, power amplifier should be output at the value of VDD/2 (send
8000H to DAC) during the initial power on state. If software set high then clear the bit DAC_WR_TRIG (bit 3 of
DAC_WR register), the value on the DAC_Limit_L and DAC_Limit_H registers will write to DAC.
Bit No.
Label
R/W
Power-on
Functions
0~2, 4~7
R
0
Undefined bit, read as 0 .
3
DAC_WR_TRIG
R/W
0
DAC write trigger bit
DAC_WR (2FH) Register
Example to avoid popping noise:
System_Initial:
;-----------------------------------------------------------
; Avoid Pop Noise
;-----------------------------------------------------------
mov
a,WDTS
mov
FIFO_TEMP,a
;Save WDTS value
mov
a,01010000b
andm
a,WDTS
mov
a,01010000b
orm
a,WDTS
;Enter DAC Write Data mode, high nibble of WDTS=0101b
clr
[02DH]
;Set DAC data low byte=00H
mov
a,80H
mov
[02EH],a
;Set DAC data high byte=80H
nop
;Write 8000H to DAC
set
[02FH].3
nop
clr
[02FH].3
nop
;-----------------------------------------------------------
mov
a,FIFO_TEMP
;Restore WDTS value
mov
WDTS,a
;Quit DAC Write Data mode
;-----------------------------------------------------------
Note: At DAC write data mode (high nibble of WDTS register is 0101b), DAC_Limit_Land DAC_Limit_H registers will
be the 16-bit DAC input data register at falling edge of DAC_WR_TRIG. Otherwise, these two registers are
used to define the 16-bit DAC output limit.
相關(guān)PDF資料
PDF描述
HT82A822R USB Audio MCU
HT82A822R_07 USB Audio MCU
HT82A832R Basic USB Phone OTP MCU
HT82A850R Audio MCU
HT82A851R USB Audio MCU
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HT82A822R 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU
HT82A822R_07 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU
HT82A824R 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU
HT82A832R 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU
HT82A832R_07 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*