SH7708 datasheet(419/633 Pages) RENESAS

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14.1.3

Pin Configuration

Table 14.1 summarizes the smart card interface pins.

Table 14.1

SCI Pins

Pin Name

Abbreviation Input/Output

Function

Serial clock pin

SCK

Output

Clock output

Receive data pin

RxD

Input

Receive data input

Transmit data pin

TxD

Output

Transmit data output

14.1.4

Table 14.2 summarizes the registers used by the smart card interface. The SCSMR, SCBRR,

SCSCR, SCTDR, and SCRDR registers are the same as in the ordinary SCI function. They are

described in section 13, Serial Communication Interface.

Table 14.2

Registers

Name

Abbreviation R/W

Initial Value*

Address

Access Size

Serial mode register

SCSMR

R/W

H'00

H'FFFFFE80

Bit rate register

SCBRR

R/W

H'FF

H'FFFFFE82

Serial control register

SCSCR

R/W

H'00

H'FFFFFE84

Transmit data register

SCTDR

R/W

H'FF

H'FFFFFE86

Serial status register

SCSSR

R/(W)*

H'84

H'FFFFFE88

Receive data register

SCRDR

H'00

H'FFFFFE8A

Smart card mode register SCSCMR

R/W

H'FFFFFE8C

Notes: 1. Only 0 can be written, to clear the flags.

2. Bits 0, 2, and 3 are cleared. The value of the other bits is undefined.

3. Initialized by a power-on or manual reset.

14.2

This section describes the registers added for the smart card interface and the bits whose functions

are changed.

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