Renesas SH7709S Manual De Usuario

Rev. 5.00, 09/03, page 493 of 760

Bit 0—Smart Card Interface Mode Select (SMIF): Enables the smart card interface function.

0

Smart card interface function disabled

(Initial value)

1

Smart card interface function enabled

In smart card interface mode, the function of SCSSR bit 4 is changed. The setting conditions for
bit 2, the TEND bit, are also changed.

Bit:

7

6

5

4

3

2

1

0

TDRE

RDRF

ORER FER/ERS

PER

TEND

MPB

MPBT

Initial  value:

1

0

0

0

0

1

0

0

R/W:

R/(W)

*

R/(W)

*

R/(W)

*

R/(W)

*

R/(W)

*

R

R

R/W

Note:

Only 0 can be written, to clear the flag.

Bit 7—Transmit Data Register Empty (TDRE)
Bit 6—Receive Data Register Full (RDRE)
Bit 5—Overrun Error (ORER)
These bits have the same function as in the ordinary SCI. See section 14, Serial Communication
Interface (SCI), for more information.

Bit 4—Error Signal Status (ERS): In the smart card interface mode, bit 4 indicates the state of
the error signal returned from the receiving side during transmission. The smart card interface
cannot detect framing errors.

0

Receiving ended normally with no error signal

(Initial value)

[Clearing conditions]

(1) By a reset or in standby mode

(2) Cleared by reading ERS when ERS = 1, then writing 0 to ERS

1

An error signal indicating a parity error was transmitted from the receiving side

[Setting condition]

If the error signal sampled is low

Note:

The ERS flag maintains its state even when the TE bit in SCSCR is cleared to 0.