tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 287

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA001
18.4.7 Start/stop condition generation
SDA0 pin
INTSBI0 Interrupt request
SCL0 pin
not recognized. They are handled as data just after generating the start condition. SBI0CR2<TRX> is not
changed by the hardware.
a bus after generating a start condition by writing "1" to SBI0CR2 <MST>, SBI0CR2<TRX>, SBI0CR2<BB>
and SBI0CR2<PIN>. It is necessary to set SBI0CR1<ACK> to "1" before generating the start condition.
"1" to SBI0CR2<MST>, SBI0CR2<TRX> and SBI0CR2<PIN> and writing "0" to SBI0CR2<BB>.
a stop condition is generated after releasing the SCL line.
when the start condition on the bus is detected (Bus Busy State) and is cleared to "0" when the stop condition is
detected (Bus Free State).
When the serial bus interface circuit operates in the free data format, a slave address and a direction bit are
When SBI0SR2<BB> is "0", a slave address and a direction bit which are set to the SBI0DBR are output on
When SBI0CR2<BB> is "1", the sequence of generating the stop condition on the bus is started by writing
When a stop condition is generated. The SCL line on a bus is pulled down to the low level by another device,
The bus condition can be indicated by reading the contents of SBI0SR2<BB>. SBI0SR2<BB> is set to "1"
Start condition
Figure 18-9 Generating the Start Condition and a Slave Address
Table 18-3 SBI0CR1<TRX> Operation in Each Mode
Slave mode
Master
Mode
mode
A6
1
Figure 18-10 Stop Condition Generation
Direction bit
SCL0 pin
SDA0 pin
A5
"0"
"1"
"0"
"1"
2
A4
Slave address and direction bit
3
A received slave address is
the same as the value set to
I2C0AR<SA>
ACK signal is returned
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A3
Changing condition
4
Stop condition
A2
5
A1
6
A0
TRX after changing
7
"0"
"1"
"1"
"0"
R/W
8
Acknowledge signal
9
TMP89FM42