R8CSLASH20 datasheet(333/501 Pages) RENESAS

333 / 501 page

R8C/20 Group, R8C/21 Group

16. Clock Synchronous Serial Interface

Rev.2.00 Aug 27, 2008

Page 317 of 458

REJ09B0250-0200

Figure 16.26

ICMR Register

IIC Bus Mode Register

Symbol

Address

After Reset

ICMR

00BAh

00011000b

Bit Symbol

Bit Name

Function

MSB-first / LSB-first select

NOTES:

6. Set to 0 w hen the I2C bus format is used.

When w rite to the BC0 to BC2 bits, w rite 0 to the BCWP bit using the MOV instruction.

—

(b4)

Nothing is assigned. If necessary, set to 0.

When read, the content is 1.

—

Rew rite betw een transfer frames. When w rite values other than 000b, w rite w hen the SCL signal is “L”.

After data including the acknow ledge bit is transferred, bits b2 to b0 are automatically set to 000b. When the start

condition is detected, these bits are automatically set to 000b.

Do not rew rite w hen the clock synchronous serial format is used.

Reserved bit

When rew rite to the BC0 to BC2 bits, w rite 0

simultaneously.(2,4)

When read, its content is 1.

The setting value is enabled in master mode of the I2C bus format. It is disabled in slave mode of the I2C bus format or

w hen the clock synchronous serial format is used.

0 : No w ait

(Transfer data and acknow ledge bit

consecutively)

1 : Wait

(After the falling of the clock for the final

data bit, “L” period is extended for tw o

transfer clocks)

Set to 0

0 : Data transfer by MSB-first(6)

1 : Data transfer by LSB-first

—

(b5)

WAIT

b3 b2 b1 b0

b7 b6 b5 b4

Wait insertion bit(5)

BCWP

BC w rite protect bit

MLS

BC1

BC2

Bit counter 2 to 0

I2C bus format (remaining transfer bit numbers

w hen read out and data bit numbers of transfer to

the next w hen w rite)(1,2)

b2 b1 b0

0 0 0 : 9 bits(3)

0 0 1 : 2 bits

0 1 0 : 3 bits

0 1 1 : 4 bits

1 0 0 : 5 bits

1 0 1 : 6 bits

1 1 0 : 7 bits

1 1 1 : 8 bits

Clock synchronous serial format (w hen read, read

the remaining transfer bit numbers and w hen w rite,

w rite 000b.)

b2 b1 b0

0 0 0 : 8 bits

0 0 1 : 1 bit

0 1 0 : 2 bits

0 1 1 : 3 bits

1 0 0 : 4 bits

1 0 1 : 5 bits

1 1 0 : 6 bits

1 1 1 : 7 bits

BC0

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