M306V2ME Datasheet, PDF (138/276 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M306V2ME-XXXFP
M306V2EEFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
(5) I²Ci control register (i = 0, 1)
The I²Ci control register controls the data communication format.
s Bits 0 to 2: bit counter (BC0–BC2)
These bits decide the number of bits for the next 1-byte data to be transmitted. An interrupt request
signal occurs immediately after the number of bits specified with these bits are transmitted.
When a START condition is received, these bits become “0002” and the address data is always trans-
mitted and received in 8 bits.
Note: When the bit counter value = “1112,” a STOP condition and START condition cannot be waited.
s Bit 3: I²C-BUS interface i use enable bit (ESO)
This bit enables usage of the multimaster I²C-BUS interface i. When this bit is set to “0,” the use
disable status is provided, so the SDA and the SCL become high-impedance. When the bit is set to
“1,” use of the interface is enabled.
When ESO = “0,” the following is performed.
• PIN = “1,” BB = “0” and AL = “0” are set (they are bits of the I²Ci status register).
• Writing data to the I²Ci data shift register and the I²Ci transmit buffer register is disabled.
s Bit 4: data format selection bit (ALS)
This bit decides whether or not to recognize slave addresses. When this bit is set to “0,” the address-
ing format is selected, so that address data is recognized. When a match is found between a slave
address and address data as a result of comparison or when a general call (refer to “(6) I²Ci status
register,” bit 1) is received, transmission processing can be performed. When this bit is set to “1,” the
free data format is selected, so that slave addresses are not recognized.
s Bit 5: addressing format selection bit (10BIT SAD)
This bit selects a slave address specification format. When this bit is set to “0,” the 7-bit addressing
format is selected. In this case, only the high-order 7 bits (slave address) of the I²Ci address register
are compared with address data. When this bit is set to “1,” the 10-bit addressing format is selected, all
the bits of the I²Ci address register are compared with address data.
Rev. 1.0
138