M37212 Mitsubishi, M37212 Datasheet - Page 35

• Manufacturer Part Number: M37212
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
• Manufacturer: Mitsubishi

8.6.4 I
The I
nication format.
(1) 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 “000
the address data is always transmitted and received in 8 bits.
(2) Bit 3: I
This bit enables usage of the multimaster I
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 I
• Writing data to the I
Fig. 8.6.5 Connection Port Control by BSEL0 and BSEL1
Rev. 1.0
status register at address 00D9
abled.
2
C control register (address 00DA
2
C Control Register
2
C interface use enable bit (ESO)
2
C data shift register (address 00D7
16
).
Note: Set the corresponding direction register to “1” to use the
16
) controls the data commu-
2
port as multi-master I
M37212M4/M8–XXXSP, M37212M6–XXXSP/FP
C BUS interface. When
M u l t i - m a s t e r
I
i n t e r f a c e
2
C - B U S
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
S C L
S D A
16
) is dis-
2
” and
2
2
C
C-BUS interface.
(3) 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 addressing format is selected, so that ad-
dress data is recognized. When a match is found between a slave
address and address data as a result of comparison or when a gen-
eral call (refer to “8.6.5 I
mission processing can be performed. When this bit is set to “1,” the
free data format is selected, so that slave addresses are not recog-
nized.
(4) 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 I
dress 00D8
to “1,” the 10-bit addressing format is selected, all the bits of the I
address register are compared with address data.
(5) Bits 6 and 7: connection control bits between
These bits controls the connection between SCL and ports or SDA
and ports (refer to Figure 8.6.5).
“ 0 ”
“ 1 ” B S E L 0
“ 0 ”
“ 1 ” B S E L 1
“ 0 ”
“ 1 ” B S E L 0
“ 0 ”
“ 1 ” B S E L 1
16
) are compared with address data. When this bit is set
S C L 1 / P 1
S C L 2 / P 1
S D A 1 / P 1
S D A 2 / P 1
with ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
I
(BSEL0, BSEL1)
2
2
C Status Register,” bit 1) is received, trans-
C-BUS interface and ports
1
2
3
4
M37212EFSP/FP
2
C address register (ad-
2
35
C