SH7721 datasheet(714/1524 Pages) RENESAS

714 / 1524 page

Section 20

2C Bus Interface (IIC)

Rev. 3.00 Jan. 18, 2008 Page 652 of 1458

REJ09B0033-0300

Bit

Bit Name

Initial

Value

R/W

Description

5, 4



All 1



Reserved

These bits are always read as 1.

BCWP

R/W

BC Write Protect

This bit controls the BC2 to BC0 modifications. When

modifying BC2 to BC0, this bit should be cleared to 0 and

use the MOV instruction.

0: When writing, values of BC2 to BC0 are set.

1: When reading, 1 is always read.

When writing, settings of BC2 to BC0 are invalid.

BC2

BC1

BC0

R/W

Bit Counter 2 to 0

These bits specify the number of bits to be transferred

next. When read, the remaining number of transfer bits is

indicated. With the I

2C bus format, the data is transferred

with one addition acknowledge bit. Bit BC2 to BC0

settings should be made during an interval between

transfer frames. If bits BC2 to BC0 are set to a value

other than 000, the setting should be made while the SCL

pin is low. The value returns to 000 at the end of a data

transfer, including the acknowledge bit.

2C Bus Format

000: 9 bits

001: 2 bits

010: 3 bits

011: 4 bits

100: 5 bits

101: 6 bits

110: 7 bits

111: 8 bits

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