Atmel AT85DVK-07 Especificaciones descargar pdf (Pagina 143)

143

AT85C51SND3Bx

7632A–MP3–03/06

Reset Value = 0000 0000b

Table 145. UPSTAX Register

UPSTAX (1.CEh) – USB Pipe Status Register

7 6 5 4 3 2 1 0

CFGOK OVERFI UNDERFI - DTSEQ1 DTSEQ0 NBUSYBK1 NBUSYBK0

Bit

Number

Bit

Mnemonic

Description

7 CFGOK

Configure Pipe Memory OK

Set by hardware if the required memory configuration has been successfully

performed.

Cleared by hardware when the pipe is disabled. The USB reset and the reset

pipe have no effect on the configuration of the pipe.

6 OVERFI

Overflow

Set by hardware when a the current Pipe has received more data than the

maximum length of the current Pipe. An interrupt is triggered if the FLERRE bit is

set.

Shall be cleared by software. Setting by software has no effect.

5 UNDERFI

Underflow

Set by hardware when a transaction underflow occurs in the current isochronous

or interrupt Pipe. The Pipe can’t send the data flow required by the device. A ZLP

will be sent instead. An interrupt is triggered if the FLERRE bit is set.

Shall be cleared by software. Setting by software has no effect.

Note: the Host controller has to send a OUT packet, but the bank is empty. A ZLP

will be sent and the UNDERFI bit is set

underflow for interrupt Pipe:

4 -

Reserved

The value read from this bit is always 0. Do not set this bit.

3-2 DTSEQ1:0

Toggle Sequencing Flag

Set by hardware to indicate the PID data of the current bank:

00bData0

01bData1

1xbReserved.

For OUT Pipe, this value indicates the next data toggle that will be sent. This is

not relative to the current bank.

For IN Pipe, this value indicates the last data toggle received on the current

bank.

1-0

NBUSYBK1:

Busy Bank Flag

Set by hardware to indicate the number of busy bank.

For OUT Pipe, it indicates the number of busy bank(s), filled by the user, ready

for OUT transfer.

For IN Pipe, it indicates the number of busy bank(s) filled by IN transaction from

the Device.

00bAll banks are free

01b1 busy bank

10b2 busy banks

11bReserved.

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 262 263

Atmel AT85DVK-07 Especificaciones Pagina 143

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Atmel AT85DVK-07 Especificaciones Pagina 143

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