TMP88CS38 datasheet(86/226 Pages) TOSHIBA

86 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-86

2.9

Serial Bus Interface (SBI-ver. D)

The TMP88CS38 and TMP88CM38ACP38A has a 1-channel serial bus interface which

employs a clocked-synchronous 8-bit serial bus interface and an I2C bus (a bus system by

Philips). The serial bus interface pins are selectively used as either channel 0 or channel 1.

The serial interface is connected to external devices through P35 (SDA0)/P52 (SDA1) and P34

(SCL0)/P51 (SCL1) in the I2C bus mode; and through P53 ( SCK1 ), P52 (SO1) and P51 (SI1) in

the clocked-synchronous 8-bit SIO mode.

The serial bus interface pins are also used for the P3/P5 port. When used for serial bus

interface pins, set the P3/P5 output latches of these pins to “1”. When not used as serial bus

interface pins, the P3/P5 port is used as a normal I/O port.

Note 1: When P3 and P5 is used as serial bus interface pins, P35, P34, P51 and P50 should be set

as a sink open-drain output by clearing PSELCR to “0”.

Note 2: The I

2C of TMP88CS38 and TMP88CM38A/CP38A can be used only in the standard mode

of I

2C. The fast mode and the high speed mode can not be used.

2.9.1

Configuration

Figure 2.9.1 Serial Bus Interface (SBI)

INTSBI interrupt request

SIO

clock

control

SIO

data control

Transfer

control

circuit

2C bus

clock

sync.

Control

Shift

2C bus

data

control

SCL

Input/

output

control

fc/2

SBICRB/

SBISR

SBIDBR

SBICRA

SBI control register B/

SBI status register

2C bus

address register

SBI data

buffer register

SBI control register A

SDA

P52

P34

(SDA1/SO1)

(SDA0)

(SCL0)

P35

Divider

Noise

canceller

Noise

canceller

I2CAR

Source clock

generator

fc/4

SCK

P53

( SCK )

P51

(SCL1/SI1)

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