m37280eksp Mitsumi Electronics, Corp., m37280eksp Datasheet - Page 37

• Manufacturer Part Number: m37280eksp
• Description: Single-chip 8-bit Cmos Microcomputer With Closed Caption Decoder And On-screen Display Controller
• Manufacturer: Mitsumi Electronics, Corp.

12.6.4 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. 12.6.5 Connection Port Control by BSEL0 and BSEL1
Rev. 1.0
status register at address 00F8
abled.
2
C control register (address 00F9
2
2
C Interface Use Enable Bit (ESO)
C Control Register
2
C data shift register (address 00F6
16
).
Note: When using multi-master I
16
) controls the data commu-
2
4 of the serial I/O mode register (address 0213
Moreover, set the corresponding direction register to “1” to
use the port as multi-master I
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
C BUS interface. When
Multi-master
I
interface
2
C-BUS
SCL
SDA
M37280MF–XXXSP, M37280MK–XXXSP
16
) is dis-
2
” and
2
C
2
C-BUS interface, set bits 3 and
2
(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 “12.6.5 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 00F7
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 I
face and Ports (BSEL0, BSEL1)
These bits controls the connection between SCL and ports or SDA
and ports (refer to Figure 12.6.5).
C-BUS interface.
“0”
“1” BSEL0
“0”
“1” BSEL1
“0”
“1” BSEL0
“0”
“1” BSEL1
16
) are compared with address data. When this bit is set
SCL1/P1
SCL2/P1
SDA1/P1
SDA2/P1
and ON-SCREEN DISPLAY CONTROLLER
16
) to “1.”
MITSUBISHI MICROCOMPUTERS
2
C Status Register,” bit 1) is received, trans-
1
2
3
4
M37280EKSP
2
C address register (ad-
2
C-BUS Inter-
2
37
C