TMP88CS38 datasheet(89/226 Pages) TOSHIBA

89 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-89

2.9.7

2C Bus Mode Control

The following registers are used to control the serial bus interface (SBI) and monitor the

operation status in the I2C bus mode.

Serial Bus Interface Control Register A

SBICRA

(00020H)

ACK

SCK

(Initial value: 0000 *000)

ACK

= 0

ACK

= 1

Number of

clock

Bits

Number of

clock

Bits

000

001

010

011

100

101

110

Number of transferred bits

111

Write

only

ACK

Master mode

Slave mode

Not generate a clock

pulse for an

acknowledgement.

Not count a clock pulse

for an

acknowledgement.

ACK

Acknowledgement mode

specification

Generate a clock pulse

for an

acknowledgement.

Count a clock pulse for

an acknowledgement.

R/W

DV1CK

= 0

DV1CK

= 1

SCK

Serial clock selection

(At fc

= 16 MHz, output on SCL pin)

000: Reserved (Note 3)

001: Reserved (Note 3)

010: Reserved (Note 3)

011:

60.6 kHz

100:

30.7 kHz

101:

15.5 kHz

110:

7.8 kHz

111: Reserved

000: Reserved(Note 3)

001: Reserved(Note 3)

010:

58.8 kHz

011:

30.3 kHz

100:

15.4 kHz

101:

7.7 kHz

110:

3.9 kHz

111: Reserved

Write

only

Note 1:

Set the BC to “000” before switching to 8-bit SIO bus mode.

Note 2:

SBICRA cannot be used with any of read-modify-write instructions such as bit manipulation, etc.

Note 3:

This I2C bus circuit does not support the Fast mode. It supports the Standard mode only. Although

the I2C bus circuit itself allows the setting of a baud rate over 100 kbps, the compliance with the I2C

specification is not guaranteed in that case.

Serial Bus Interface Data Buffer Register

SBIDBR

(00021H)

(Initial value: **** ****)

R/W

Note 1:

For writing transmitted data, start from the MSB (Bit7).

Note 2:

The data which was written into SBIDBR cannot be read, since a write data buffer and a read buffer are

independent in SBIDBR. Therefore, SBIDBR cannot be used with any of read-modify-write instructions

such as bit manipulation, etc.

2C bus Address Register

Slave address

I2CAR

(00022H)

SA6

SA5

SA4

SA3

SA2

SA1

SA0

ALS

(Initial value: 0000 0000)

Slave address selection

ALS

Address recognition mode

specification

0: Slave address recognition

1: Non slave address recognition

Write

only

Note 1:

I2CAR is write-only register and cannot be used with any of read-modify-write instruction such as bit

manipulation, etc.

Note 2:

Do not set I2CAR to “00H” to avoid the incorrect response of acknowledgment in slave mode. If “00H” is set

to I2CAR as the Slave Address and received “01H” in slave mode, the device might transmit the

acknowledgement incorrectly.

Figure 2.9.5 Serial Bus Interface Control Register A, Serial Bus Interface Data Buffer Register

and I

2C Bus Address Register In The I2C Bus Mode

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