參數(shù)資料
型號: AT85C51SND3B1-RTTUL
廠商: Atmel
文件頁數(shù): 6/119頁
文件大?。?/td> 0K
描述: IC DECODER/ENCODER DGTL 100-LQFP
標(biāo)準(zhǔn)包裝: 90
類型: 音頻編碼器/解碼器
應(yīng)用: 移動電話,手機,視頻顯示器
電壓 - 電源,數(shù)字: 1.65 V ~ 3.6 V
安裝類型: 表面貼裝
封裝/外殼: 100-LQFP
供應(yīng)商設(shè)備封裝: 100-LQFP(14x14)
包裝: 托盤
103
AT85C51SND3B
7632D–MP3–01/07
Clear DFCRDY to freeze the DFC transfer,
If the CPU EPNUM has to be changed: EPNUMS cleared, EPNUM =
endpoint0
Read endpoint0 data (UEDATX)
Set DFCRDY. This resumes the DFC transfer.
Endpoint Activation
The endpoint is maintained under reset as long as the EPEN bit is not set.
The following flow must be respected in order to activate an endpoint:
Figure 60. Endpoint activation flow:
As long as the endpoint is not correctly configured (CFGOK cleared), the hardware does
not acknowledge the packets sent by the host.
CFGOK is will not be sent if the Endpoint size parameter is bigger than the DPRAM
size.
A clear of EPEN acts as an endpoint reset (see Section “Endpoint Reset” for more
details). It also performs the next operation:
The configuration of the endpoint is kept (EPSIZE, EPBK, ALLOC kept)
It resets the data toggle field.
The DPRAM memory associated to the endpoint is still reserved.
See Section “Memory Management”, page 90 for more details about the memory
allocation/reorganization.
Address Setup
The USB device address is set up according to the USB protocol:
the USB device, after power-up, responds at address 0
Endpoint
Activation
CFGOK=1
ERROR
No
Yes
Endpoint activated
Activate the endpoint
Select the endpoint
EPEN=1
UENUM
EPNUM=x
Test the correct endpoint
configuration
UECFG1X
ALLOC
EPSIZE
EPBK
Configure:
- the endpoint size
- the bank parametrization
Allocation and reorganization of
the memory is made on-the-fly
UECFG0X
EPDIR
EPTYPE
...
Configure:
- the endpoint direction
- the endpoint type
- the Not Yet Disable feature
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