at85c51snd3 ATMEL Corporation, at85c51snd3 Datasheet - Page 122

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

122
AT85C51SND3B
Reset Value = 0000 0000b
Table 125. UESTA1X Register
UESTA1X (1.CFh) – USB Endpoint Status 1 Register
Reset Value = 0000 0000b
Number
Number
3-2
1-0
7-3
1-0
Bit
Bit
7
2
-
NBUSYBK1:
CURRBK1:0
Mnemonic Description
Mnemonic Description
DTSEQ1:0
CTRLDIR
Bit
Bit
0
6
-
-
Data Toggle Sequencing Flag
Set by hardware to indicate the PID data of the current bank:
00b: Data0
01b: Data1
1xb: Reserved.
For OUT transfer, this value indicates the last data toggle received on the current
bank.
For IN transfer, it indicates the Toggle that will be used for the next packet to be
sent. This is not relative to the current bank.
Busy Bank Flag
Set by hardware to indicate the number of busy bank.
For IN endpoint, it indicates the number of busy bank(s), filled by the user, ready
for IN transfer.
For OUT endpoint, it indicates the number of busy bank(s) filled by OUT
transaction from the host.
00b: All banks are free
01b: 1 busy bank
10b: 2 busy banks
11b: Reserved.
Reserved
The value read from these bits is always 0. Do not set these bits.
Control Direction (Flag, and bit for debug purpose)
Set by hardware after a SETUP packet, and gives the direction of the following
packet:
- 1 for IN endpoint
- 0 for OUT endpoint.
Can not be set or cleared by software.
Current Bank (all endpoints except Control endpoint) Flag
Set by hardware to indicate the number of the current bank:
00b: Bank0
01b: Bank1
1xb: Reserved.
Can not be set or cleared by software.
5
-
4
-
3
-
CTRLDIR
2
CURRBK1
1
7632D–MP3–01/07
CURRBK0
0