SH7708 datasheet(361/633 Pages) RENESAS

361 / 633 page

343

13.1.3

Pin Configuration

The SCI has the serial pins summarized in table 13.1.

Table 13.1

SCI Pins

Pin Name

Abbreviation Input/Output

Function

Serial clock pin

SCK

Input/output

Clock input/output

Receive data pin

RxD

Input

Receive data input

Transmit data pin

TxD

Output

Transmit data output

Note:

These pins function as mode input pins MD0–MD02 after a power-on reset. They are made

to function as serial pins by performing SCI operation settings with the TE, RE, CKEI, and

CKE0 bits in SCSCR and the C/

A bit in SCSMR. Break status transmission and detection

can be performed by means of the SCI’s SCSPTR register.

13.1.4

Table 13.2 summarizes the SCI internal registers. These registers select the communication mode

(asynchronous or synchronous), specify the data format and bit rate, and control the transmitter

and receiver sections.

Table 13.2

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

Serial port register

SCSPTR

R/W

Undefined

(Initialized)*

H'FFFFFF7C

Notes: 1

Only 0 can be written, to clear the flags.

Initialized by power-on reset or manual reset.

3. All bits except 2 and 0 are initialized to 0. The value of bits 2 and 0 is undefined.

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