Atmel AT85DVK-07 Spezifikationen PDF herunterladen (Seite 122)

122

AT85C51SND3Bx

7632A–MP3–03/06

Reset Value = 0000 0000b

1-0

NBUSYBK1:

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.

Table 125. UESTA1X Register

UESTA1X (1.CFh) – USB Endpoint Status 1 Register

7 6 5 4 3 2 1 0

- - - - - CTRLDIR CURRBK1 CURRBK0

Bit

Number

Bit

Mnemonic

Description

7-3 -

Reserved

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

2 CTRLDIR

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.

1-0 CURRBK1:0

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.

Bit

Number

Bit

Mnemonic Description

1 2 ... 117 118 119 120 121 122 123 124 125 126 127 ... 262 263

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