SH7261 datasheet(817/1348 Pages) RENESAS

817 / 1348 page

Section 18 Serial Sound Interface (SSI)

Rev. 2.00 Sep. 07, 2007 Page 785 of 1312

REJ09B0320-0200

Bit

Bit Name

Initial

Value

R/W

Description

SWNO

System Word Number

This status bit indicates the current word number.

• TRMD = 0 (Receive mode)

SWNO indicates which system word the data in

SSIRDR currently represents. This value will

change as the data in SSIRDR is updated from the

shift register, regardless of whether SSIRDR has

been read.

• TRMD = 1 (Transmit mode)

SWNO indicates which system word is required to

be written to SSITDR. This value will change as the

data is copied to the shift register, regardless of

whether the data is written to SSITDR.

IDST

Idle Mode Status Flag

This status flag indicates that the serial bus activity has

stopped.

This bit is cleared if EN = 1 and the serial bus are

currently active.

This bit is automatically set to 1 under the following

conditions.

• SSI = Master transmitter (SWSD = 1 and

TRMD = 1)

This bit is set to 1 if the EN bit is cleared and the

data written to SSITDR is completely output from

the serial data input/output pin (SSIDATA), that is,

the output of the system word length is completed.

• SSI = Master receiver (SWSD = 1 and TRMD = 0)

This bit is set to 1 if the EN bit is cleared and the

current system word is completed.

• SSI = Slave transmitter/receiver (SWSD = 0)

This bit is set to 1 if the EN bit is cleared and the

current system word is completed.

Note: If the external master stops the serial bus clock

before the current system word is completed,

this bit is not set.

Notes: 1. This bit can be read from or written to. Writing 0 initializes the bit, but writing 1 is

ignored.

2. The SSI clock must be kept supplied until the SSI is in the idle state.

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