AT90SCR100 datasheet(169/433 Pages) ATMEL

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TPR0327AY–SMS–30Jan09

AT90SCR100

• Bit 1 - RCVD : Received Data Bit

This bit is a status bit.

It is set (one) by hardware and cleared (zero) by software.

If it is set (one), the DPRAM of the corresponding endpoint is filled with data coming from the

host through the USB bus.

This bit is a source for the Endpoint interrupt and must be cleared to acknowledge the

interruption.

• Bit 0 - TXC : Tx Complete Bit

This bit is a status bit.

It is set (one) by hardware and cleared (zero) by software.

If it is set (one), an ACK handshake from the host has been received on the corresponding end-

point through the USB bus.

This bit is a source for the Endpoint interrupt and must be cleared to acknowledge the

interruption.

14.8.8

USBDBCEX - USB Data Byte Count Registers for Endpoint X

Set USBENUM register to point to the relevant Endpoint before using the USBDBCEX register.

If a packet of data has been received from the host in the corresponding endpoint through the

USB bus, these registers indicate the amount of data bytes available in the DPRAM.

The value is considered valid if the bit USBCSEX.RCVD has been previously set by hardware.

• Bits 7..0 - BCT7..0 : Bytes Count Bits

These bits are set (one) and cleared (zero) by hardware.

14.8.9

USBFCEX - USB Function Control Registers for Endpoint X

Set USBENUM register to point to the relevant Endpoint before using the USBFCEX register.

• Bits 7 - EPE : Endpoint Enable Bit

This bit is set (one) and cleared (zero) by software.

When it is set (one) the corresponding endpoint is enabled.

When it is cleared (zero) the corresponding endpoint is disabled.

A disabled endpoint does not respond when addressed (read or written) by the host.

Bit

76543

$0000CC

BCT7

BCT6

BCT5

BCT4

BCT3

BCT2

BCT1

BCT0

USBDBCEX

Read/write

R/W

Initial value

00000

0x00

Bit

7654

$0000CD

EPE

----

EPDIR

EPTYP1 EPTYP0 USBFCEX

Read/write

R/W

RRRR

R/W

Initial value

0000

0x00

AT90SCR100 Datasheet(PDF) 169 Page - ATMEL Corporation

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