Atmel AT85DVK-07 Spezifikationen PDF herunterladen (Seite 144)

144

AT85C51SND3Bx

7632A–MP3–03/06

Reset Value = 0000 0000b

Table 146. UPINRQX Register

UPINRQX (1.DFh) – USB Pipe IN Number Of Request Register

7 6 5 4 3 2 1 0

INRQ7 INRQ6 INRQ5 INRQ4 INRQ3 INRQ2 INRQ1 INRQ0

Bit

Number

Bit

Mnemonic

Description

7-0 INRQ7:0

IN Request Number Before Freeze

Enter the number of IN transactions before the USB controller freezes the pipe.

The USB controller will perform (INRQ+1) IN requests before to freeze the Pipe.

This counter is automatically decreased by 1 each time a IN request has been

successfully performed.

Table 147. UPERRX Register

UPERRX (1.D7h) – USB Pipe Error Register

7 6 5 4 3 2 1 0

- COUNTER1 COUNTER0 CRC16 TIMEOUT PID DATAPID DATATGL

Bit

Number

Bit

Mnemonic

Description

7-6 -

Reserved

The value read from these bits is always 0. Do not set these bits.

COUNTER1:

Error counter

This counter is increased by the USB controller each time an error occurs on the

Pipe. When this value reaches 3, the Pipe is automatically frozen.

Clear these bits by software.

4 CRC16

CRC16 Error

Set by hardware when a CRC16 error has been detected.