H8SX1663 datasheet(797/1158 Pages) RENESAS

797 / 1158 page

Section 15 Serial Communication Interface (SCI, IrDA, CRC)

Rev.1.00 Jun. 07, 2006 Page 745 of 1102

REJ09B0294-0100

15.11.2

The CRC operation circuit has the following registers.

• CRC control register (CRCCR)

• CRC data input register (CRCDIR)

• CRC data output register (CRCDOR)

(1) CRC Control Register (CRCCR)

CRCCR initializes the CRC operation circuit, switches the operation mode, and selects the

generating polynomial.

Bit

Bit Name

Initial Value

R/W

DORCLR



LMS

R/W

Bit

Bit Name

Initial

Value

R/W

Description

DORCLR

CRCDOR Clear

Setting this bit to 1 clears CRCDOR to H'0000.

6 to 3

—

All 0

Reserved

The initial value should not be changed.

LMS

R/W

CRC Operation Switch

Selects CRC code generation for LSB-first or MSB-first

communication.

0: Performs CRC operation for LSB-first

communication. The lower byte (bits 7 to 0) is first

transmitted when CRCDOR contents (CRC code)

are divided into two bytes to be transmitted in two

parts.

1: Performs CRC operation for MSB-first

communication. The upper byte (bits 15 to 8) is first

transmitted when CRCDOR contents (CRC code)

are divided into two bytes to be transmitted in two

parts.

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