r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 1498

Manufacturer Part Number

r5s77631ay266bgv

Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series

Manufacturer

Renesas Electronics Corporation.

Section 34 Serial Sound Interface (SSI)

Rev. 1.00 Oct. 01, 2007 Page 1432 of 1956

REJ09B0256-0100

Underflow Error Interrupt Status Flag

This status flag indicates that the data has been

supplied at a lower rate than the required rate.

This bit is set to 1 regardless of the setting of UIEN bit.

In order to clear it to 0, write 0 in it.

If UIRQ = 1 and UIEN = 1, then an interrupt will be

When TRMD = 0 (Receive Mode):

If UIRQ = 1, it indicates that SSIRDR was read out

before DMRQ and DIRQ bits would indicate the

existence of new unread data. In this instance, the

same received data may be stored twice by the host,

which can lead to destruction of multi-channel data.

When TRMD = 1 (Transmit Mode):

If UIRQ = 1, it indicates that the transmitted data was

not written in SSITDR. By this, the same data may be

transmitted one time too often, which can lead to

destruction of multi-channel data. Consequently,

erroneous SSI data will be output, which makes this

error more serious than underflow in the receive mode.

Note: When underflow error occurs, the data in the data

buffer will be transmitted until the next data is