ATmega16U2 datasheet(218/314 Pages) ATMEL

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218

7799B–AVR–07/09

ATmega8U2/16U2/32U2

• Bit 1:0 – NBUSYBK[1:0]: Busy Bank Flag

These flags are set by hardware to indicate the number of busy bank for the selected endpoint

as shown in Table 21-6.

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.

21.18.14 UESTA1X – USB Endpoint Status 1 Register

• Bits 7:3 – Res: Reserved

These bits are reserved and will always read as zero.

• Bit 2 – CTRLDIR: Control Direction

This flag is updated by the USB controller when a SETUP packet has been received. This flag

bit can be used for debug purpose to give the direction of the following packet. Reading one

from this flag means that the following packet is for an IN request, reading zero for an OUT

request.

• Bits 1:0 – CURRBK[1:0]: Current Bank

These flags are set by hardware to indicate the current bank number in used with the selected

endpoint as shown in Table 21-6. These flags are not relevant for control endpoint (control end-

point can not be configured in dual bank mode).These flags can be used for debug purpose and

are optional for data transfer with endpoint in dual bank mode.

Table 21-6.

NBUSYBK[1:0] Bits Settings

NBUSYBK1

NBUSYBK0

Number of busy banks

All banks are free

1 busy bank

2 busy banks

Reserved

Bit

(0xEF)

CTRLDIR

CURRBK[1:0]

UESTA1X

Read/Write

Initial Value

Table 21-7.

CURRBK[1:0] Bits Settings

CURRBK1

CURRBK0

Current Bank Number

Bank 0

Bank 1

Reserved

ATmega16U2 Datasheet(PDF) 218 Page - ATMEL Corporation

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