Toshiba TLCS-870/C1 Series, Manual

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Page 267
TMP89FM42
RA001
Note 1: Don't set I2C0AR<SA> to "0x00". If it is set to "0x00", the slave address is deemed to be matched when the I
2
C bus stan-
dard start byte ("0x01") is received in the slave mode.
Note 2: Don't change the contents of the registers when the start condition is generated, the stop condition is generated or the
data transfer is in progress. Write data to the registers before the start condition is generated or during the period from
when an interrupt request is generated for stopping the data transfer until it is released.
Note 3: After a software reset is generated, all the bits of the SBI0CR2 register except SBI0CR2<SBIM> and the SBI0CR1,
I2C0AR and SBI0SR2 registers are initialized.
Note 4: When the operation is switched to STOP, IDLE0 or SLOW mode, the SBI0CR2 register, except SBI0CR2<SBIM>, and the
SBI0CR1, I2C0AR and SBI0DBR registers are initialized.
Note 1: Write the transmit data beginning with the most significant bit (bit 7).
Note 2: SBI0DBR has individual writing and reading buffers, and written data cannot be read out. Therefore, SBI0DBR must not
be accessed by using a read-modify-write instruction, such as a bit operation.
Note 3: Don't change the contents of the registers when the start condition is generated, the stop condition is generated or the
data transfer is in progress. Write data to the registers before the start condition is generated or during the period from
when an interrupt request is generated for stopping the data transfer until it is released.
Note 4: To set SBI0CR2<PIN> to "1" by writing the dummy data to SBI0DBR, write 0x00. Writing any data other than 0x00 causes
an improper value in the subsequently received data.
Note 5: When the operation is switched to STOP, IDLE0 or SLOW mode, the SBI0CR2 register, except SBI0CR2<SBIM>, and the
SBI0CR1, I2C0AR and SBI0DBR registers are initialized.
18.4 Functions
18.4.1 Low Power Consumption Function
The serial bus interface has a low power consumption register (POFFCR1) that saves power when the serial
bus interface is not being used.
Setting POFFCR1<SBI0EN> to "0" disables the basic clock supply to the serial bus interface to save power.
Note that this makes the serial bus interface unusable. Setting POFFCR1<SBI0EN> to "1" enables the basic
clock supply to the serial bus interface and makes external interrupts usable.
After reset, POFFCR1<SBI0EN> is initialized to "0", and this makes the serial bus interface unusable. When
using the serial bus interface for the first time, be sure to set POFFCR1<SBI0EN> to "1" in the initial setting of
the program (before the serial bus interface control registers are operated).
Do not change POFFCR1<SBI0EN> to "0" during the serial bus interface operation, otherwise serial bus
interface may operate unexpectedly.
I
2
C bus address register
I2C0AR
(0x0024)
7 6 5 4 3 2 1 0
Bit Symbol SA0 ALS
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
After reset 0 0 0 0 0 0 0 0
SA Slave address setting Slave address in the slave mode
ALS Communication format selection
0: I
2
C
bus mode
1: Free data format
Serial bus interface data buffer register
SBI0DBR
(0x0025)
7 6 5 4 3 2 1 0
Bit Symbol SBI0DBR
Read/Write R/W
After reset 0 0 0 0 0 0 0 0