TMP86CS49FG datasheet(209/252 Pages) TOSHIBA

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Page 195

TMP86CS49FG

16. Serial Bus Interface(I2C Bus) Ver.-D (SBI)

The TMP86CS49FG has a serial bus interface which employs an I2C bus.

The serial interface is connected to an external devices through SDA and SCL.

The serial bus interface pins are also used as the port. When used as serial bus interface pins, set the output latches

of these pins to "1". When not used as serial bus interface pins, the port is used as a normal I/O port.

Note 1: The serial bus interface can be used only in NORMAL1/2 and IDLE1/2 mode. It can not be used in IDLE0,

SLOW1/2 and SLEEP0/1/2 mode.

Note 2: The serial bus interface can be used only in the Standard mode of I2C. The fast mode and the high-speed mode

can not be used.

Note 3: Please refer to the I/O port section about the detail of setting port.

16.1 Configuration

Figure 16-1 Serial Bus Interface (SBI)

16.2 Control

The following registers are used for control the serial bus interface and monitor the operation status.

• Serial bus interface control register A (SBICRA)

• Serial bus interface control register B (SBICRB)

• Serial bus interface data buffer register (SBIDBR)

•I2C bus address register (I2CAR)

• Serial bus interface status register A (SBISRA)

• Serial bus interface status register B (SBISRB)

16.3 Software Reset

A serial bus interface circuit has a software reset function, when a serial bus interface circuit is locked by an exter-

nal noise, etc.

To reset the serial bus interface circuit, write “10”, “01” into the SWRST (Bit1, 0 in SBICRB).

And a status of software reset canbe read from SWRMON (Bit0 in SBISRA).

Noise

canceller

Noise

canceller

SCL

Input/

output

control

SDA

SBI control register B/

SBI status register B

SBI control register A/

SBI status register A

2C bus

address register

SBI data

buffer register

Shift

2C bus data

control

Transfer

control

circuit

2C bus

clock sysn.

Control

Divider

fc/4

SBICRB/

SBISRB

I2CAR

SBIDBR

SBICRA/

SBISRA

SCL

SDA

INTSBI interrupt request

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