SH7721 datasheet(1055/1524 Pages) RENESAS

1055 / 1524 page

Section 30

SIM Card Module (SIM)

Rev. 3.00 Jan. 18, 2008 Page 993 of 1458

REJ09B0033-0300

Bit

Bit Name

Initial

Value

R/W

Description

R/W

Transmit Enable

Enables/disables serial transmit operations.

0: Disables transmission*

1: Enables transmission*

2*3

Notes: 1. The TDRE flag in SCSSR is fixed to 1.

2. In this state, if transmit data is written to SCTDR,

the transmit operation is initiated. Before setting

the TE bit to 1, the serial mode register

(SCSMR) and smart card mode register

(SCSCMR) must always be set, to determine the

transmit format.

3. Even if the TE bit is cleared to 0, the ERS flag is

unaffected, and the previous state is retained.

R/W

Receive Enable

Enables/disables serial receive operations.

0: Disables reception*

1: Enables reception*

Notes: 1. Clearing the RE bit to 0 has no effect on the

RDRF, PER, ERS, ORER, or WAIT_ER flag,

and the previous state is retained.

2. If the start bit is detected in this state, serial

reception is initiated. Before setting the RE bit to

1, SCSMR and SCSCMR must always be set, to

determine the receive format.

WAIT_IE

R/W

Wait Enable

Enables/disables wait error interrupt requests.

0: Disables wait error interrupt (ERI) requests

1: Enables wait error interrupt (ERI) requests

TEIE

R/W

Transmit End Interrupt Enable

When transmission ends and the TEND flag is set to 1,

transmit end interrupt (TEI) requests are enabled/disabled.

0: Disables transmit end interrupt (TEI) requests*

1: Enables transmit end interrupt (TEI) requests*

Note: * A TEI can be canceled either by writing transmit

data to SCTDR and clearing the TEND bit, or by

clearing the TEIE bit to 0 after the TDRE flag in

SCSSR is read as 1.

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