Cirrus-logic EP93xx Manual do Utilizador descarregar pdf (Página 729)

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101

DS785UM1 23-17

Synchronous Serial Port

EP93xx User’s Guide

DATA: Transmit / Receive FIFO:

Read - Receive FIFO

Write - Transmit FIFO

Note: The user should right-justify data when the SSP is programmed for a data size that is less

than 16 bits. Unused bits at the top are ignored by transmit logic. The receive logic

automatically right justifies.

SSPSR

Address:

0x808A_000C - Read Only

Default:

0x0000_0000

Definition:

SSPSR is a read-only status register, which contains bits that indicate the

FIFO fill status and the SSP busy status.

Bit Descriptions:

RSVD: Reserved. Unknown During Read.

BSY: SSP busy flag (read-only):

0 - SSP is idle.

1 - SSP is currently transmitting and / or receiving a frame

or the transmit FIFO is non-empty.

RFF: Receive FIFO full (read-only):

0 - Receive FIFO is not full

1 - Receive FIFO is full

RNE: Receive FIFO not empty (read-only):

0 - Receive FIFO is empty.

1 - Receive FIFO is not empty

TNF: Transmit FIFO not full (read-only):

0 - Transmit FIFO is full.

1 - Transmit FIFO is not full.

TFE: Transmit FIFO empty (read-only):

0 - Transmit FIFO is not empty

1 - Transmit FIFO is empty

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

RSVD

1514131211109876543210

RSVD BSY RFF RNE TNF TFE

1 2 ... 724 725 726 727 728 729 730 731 732 733 734 ... 823 824

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