tmp89fh40 TOSHIBA Semiconductor CORPORATION, tmp89fh40 Datasheet - Page 298

• Manufacturer Part Number: tmp89fh40
• Description: 8 Bit Microcontroller Tlcs-870/c1 Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

18.4
Functions
RA002
18.4.9
18.4.10
18.4.11
SCL0 pin
INTSBI0 interrupt request
SBI0CR2<PIN>
the SBI0 pin is released takes t
software.
mode, confirm serial bus interface pins in a high level, and then, write "1" to SBI0CR2<SBIM>.
the serial bus interface circuit locks up, for example, due to noise, it can be initialized by using this function.
register, except SBI0CR2<SBIM> and the SBI0CR1, I2C0AR<SA> and SBI0SR2 registers, are initialized.
mented in order to guarantee the contents of transferred data.
on a bus. Master 1 and Master 2 output the same data until point "a". After that, when Master 1 outputs "1" and
Master 2 outputs "0", since the SDA line of a bus is wired AND, the SDA line is pulled down to the low level
by Master 2. When the SCL line of a bus is pulled-up at point "b", the slave device reads data on the SDA line,
that is data in Master 2. Data transmitted from Master 1 becomes invalid. The state in Master 1 is called "arbitration
Writing data to SBI0DBR sets SBI0CR2<PIN> to "1". The time from SBI0CR2<PIN> being set to "1" until
Although SBI0CR2<PIN> can be set to "1" by the software, SBI0CR2<PIN> can not be cleared to "0" by the
SBI0CR2<SBIM> is used to set serial bus interface mode.
Setting SBI0CR2<SBIM> to "1" selects the serial bus interface mode. Setting it to "0" selects the port mode.
Set SBI0CR2<SBIM> to "1" in order to set serial bus interface mode. Before setting of serial bus interface
And switch a port mode after confirming that a bus is free and set SBI0CR2<SBIM> to "0".
The serial bus interface circuit has a software reset function that initializes the serial bus interface circuit. If
A software reset is generated by writing "10" and then "01" to SBI0CR2<SWRST>.
After a software reset is generated, the serial bus interface circuit is initialized and all the bits of SBI0CR2
Since more than one master device can exist simultaneously on a bus, a bus arbitration procedure is imple-
Data on the SDA line is used for bus arbitration of the I
The following shows an example of a bus arbitration procedure when two master devices exist simultaneously
Setting of serial bus interface mode
Note:When SBI0CR2<SBIM> is "0", no data can be written to SBI0CR2 except SBI0CR2<SBIM>. Before
Software reset
Arbitration lost detection monitor
setting values to SBI0CR2, write "1" to SBI0CR2<SBIM> to activate the serial bus interface mode.
1
Figure 18-11 SBI0CR2<PIN> and SCL0 Pin
2
LOW
3
.
Page 284
7
2
C bus.
8
9
SCL0 pin is pulled
to low when
SBI0CR2<PIN> is "0"
Set SBI0CR2<PIN> to "1" or
write data to SBI0DBR
t LOW
TMP89FH40
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