TMP88CS77F datasheet(93/140 Pages) TOSHIBA

93 / 140 page

3-77-93

TMP88CP77/S77/U77

2007-10-23

2.10.4

I2C bus mode control

The following registers are used to control the serial bus interface (SBI-ver.C) and monitor the operation

status in the I2C bus mode.

Note 1: fc ; High-frequency clock [Hz]

Note 2: Set the BC to “000” before switching to 8-bit SIO bus mode.

Note 3: SBICR1 is write-only registers, which cannot be used with any of read-modify-write instruction such as bit

manipulation, etc.

Note 4: 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.

Note 1: For writing transmitted data, start from the MSB (bit 7).

Note 2: Cannot read the data which was written into SBIDBR, since a write data buffer and a read data buffer are

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

bit manipulation, etc.

Note 3: The data which was written into SBIDBR is cleared to “0” when INTSBI is generated.

Note: I2CAR is write-only register, which cannot be used with any of read-modify-write instruction such as bit

manipulation, etc.

Figure 2-41.Serial Bus Interface Control Register 1, Serial Bus Interface Data Buffer Register and I2C Bus

Address Register In The I2C Bus Mode

Serial Bus Interface Control Register 1

SBICR1

6543210

(00020H)

ACK

SWRST

SCK

(Initial value: 0000 0000)

Number of transferred bits

ACK = 0

ACK = 1

Write

only

Number of

Clock

Bits

Number of

Clock

Bits

000

001

010

011

100

101

110

111

ACK

Acknowledge mode specification

0: Acknowledge not returned to transmitter.

1: Acknowledge returned to transmitter.

Read/

Write

SWRST

Initiate a internal of SBI

0: -

1: Initialized (Clearing

“0” after initialized)

Read/

Write

SCK

Serial clock selection

000:Reserved (Note4)

001:Reserved (Note4)

010: 58.8 kHz

011: 30.3 kHz

at fc = 8 MHz (Output on SCL pin)

100: 15.4 kHz

101: 7.75 kHz

110: 3.89 kHz

111:Reserved

Write

only

Serial Bus Interface Data Buffer Register

SBIDBR

6543210

(00021H)

Read / Write

I2C bus Address Register

I2CAR

6543210

Slave address

ALS

(00022H)

SA6

SA5

SA4

SA3

SA2

SA1

SA0

(Initial value: 0000 0000)

88CP77/S77/U77 slave address selection

Write

only

ALS

Address recognition mode

specification

0: Slave address recognition

1: Non slave address recognition

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