SH7721 datasheet(758/1524 Pages) RENESAS

758 / 1524 page

Section 21

Serial I/O with FIFO (SIOF)

Rev. 3.00 Jan. 18, 2008 Page 696 of 1458

REJ09B0033-0300

Bit

Bit Name

Initial

Value

R/W

Description

SAERR

R/W

Slot Assign Error

0: Indicates that no slot assign error occurs

1: Indicates that a slot assign error occurs

A slot assign error occurs when the specifications in

SITDAR, SIRDAR, and SICDAR overlap.

If a slot assign error occurs, the SIOF does not transmit

data to the SIOFTxD pin and does not receive data from

the SIOFRxD pin. Note that the SIOF does not clear the

TXE bit or RXE bit in SICTR at a slot assign error.

• This bit is valid when the TXE bit or RXE bit in SICTR

is 1.

• When 1 is written to this bit, the contents are cleared.

• If the issue of interrupts by this bit is enabled, an

SIOF interrupt is issued.

FSERR

R/W

Frame Synchronization Error

0: Indicates that no frame synchronization error occurs

1: Indicates that a frame synchronization error occurs

A frame synchronization error occurs when the next

frame synchronization timing appears before the previous

data or control data transfers have been completed.

If a frame synchronization error occurs, the SIOF

performs transmission or reception for slots that can be

transferred.

• This bit is valid when the TXE or RXE bit in SICTR is

• When 1 is written to this bit, the contents are cleared.

Writing 0 to this bit is invalid.

• If the issue of interrupts by this bit is enabled, an

SIOF interrupt is issued.

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