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TMP92CM22
2007-02-16
92CM22-172
3.10 Serial Bus Interface (SBI)
The TMP92CM22 has a 1-channel serial bus interface. Serial bus interface (SBI0) include
following 2 operation modes.
• I
2
C bus mode (Multi master)
• Clocked-synchronous 8-bit SIO mode
The serial bus interface is connected to an external device through P91 (SDA) and P92 (SCL)
in the I
2
C bus mode; and through P90 (SCK), P91 (SO), and P92 (SI) in the clocked-synchronous
8-bit SIO mode.
Each pin is specified as follows.
P9ODE
<P92ODE, P91ODE>
P9CR
<P92C, P91C, P90C>
P9FC
<P92F, P91F, P90F>
I
2
C bus mode 11 11X 11X
Clocked-synchronous
8-bit SIO mode
XX
011
010
011
010 (Note)
X: Don’t care
Note: When using SI and SCK input function, set P9FC<P92F,P90F> to “0” (Function setting).
3.10.1 Configuration
Figure 3.10.1 Serial Bus Interface 0 (SBI0)
SIO
clock
control
Divider
I
2
C bus
clock sync.
+
Control
SBI0CR2/
SBI0SR
SCL
SCK
I/O
control
SO
SI
SDA
I2C0AR SBI0BR SBI0CR1 SBI0BR0, 1
Shift register
Transfer
control
circuit
Noise
canceller
φＴ
Noise
canceller
I
2
C bus data
control
SIO
data control
INTSBE0 interrupt requests
P91
(SO/SDA)
P92
(SI/SCL)
SBI0 control register 2/
SBI0 status register
I
2
C0 bus
address register
SBI0 data
buffer register
SBI0 control
register 1
SBI0 baud rate registers 0 and 1
P90
(SCK)