SH7721 datasheet(663/1524 Pages) RENESAS

663 / 1524 page

Section 18

Serial Communication Interface with FIFO (SCIF)

Rev. 3.00 Jan. 18, 2008 Page 601 of 1458

REJ09B0033-0300

Bit

Bit Name Initial Value R/W

Description

TSF

R/(W)* Transmit Data Stop Flag

Indicates that the number of transmit data matches the

value set in SCTDSR.

0: Transmit data number does not match the value set

in SCTDSR

[Clearing conditions]

• Power-on reset, manual reset

• Writing 0 after reading TSF = 1

1: Transmit data number matches the value set in

SCTDSR

R/(W)* Receive Error

Indicates that a framing error or parity error occurred

during reception in asynchronous mode.*

0: Receive is normally completed without any framing or

parity error

[Clearing conditions]

Power-on reset, manual reset

ER is read as 1, then written to with 0.

1: A framing error or a parity error has occurred during

receiving

[Setting conditions]

• The stop bit is 0 after checking whether or not the

last stop bit of the received data is 1 at the end of

one-data receive.*

• The total number of 1's in the received data and in

the parity bit does not match the even/odd parity

specification specified by the O/

E bit in the SCSMR.

Notes: 1. Indicates clearing the RE bit to 0 in SCSCR

does not affect the ER bit, which retains its

previous value. Even if a receive error

occurs, the received data is transferred to

SCFRDR and the receive operation is

continued. Whether or not the data read

from SCRDR includes a receive error can

be detected by the FER and PER bits in

SCSSR.

2. n the stop mode, only the first stop bit is

checked; the second stop bit is not checked.

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