SH7261 datasheet(816/1348 Pages) RENESAS

816 / 1348 page

Section 18 Serial Sound Interface (SSI)

Rev. 2.00 Sep. 07, 2007 Page 784 of 1312

REJ09B0320-0200

Bit

Bit Name

Initial

Value

R/W

Description

DIRQ

Data Interrupt Status Flag

This status flag indicates that the module has data to

be read or requires data to be written.

In either case this bit is set to 1 regardless of the value

of the DIEN bit to allow polling.

The interrupt can be masked by clearing DIEN, but

cannot be cleared by writing to this bit.

If DIRQ= 1 and DIEN = 1, an interrupt occurs.

• TRMD = 0 (Receive mode)

0: No unread data in SSIRDR

1: Unread data in SSIRDR

• TRMD = 1 (Transmit mode)

0: Transmit buffer is full.

1: Transmit buffer is empty and requires data to be

written to SSITDR.

23 to 4



Undefined

Reserved

The read value is not guaranteed. The write value

should always be 0.

3, 2

CHNO[1:0]

Channel Number

This value indicates the current channel number.

• TRMD = 0 (Receive mode)

CHNO indicates which channel the data in SSIRDR

currently represents. This value will change as the

data in SSIRDR is updated from the shift register.

• TRMD = 1 (Transmit mode)

CHNO indicates which channel 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.

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