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参数资料
| 型号： | M38513E4FP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDSO42 |
| 封装： | 0.450 INCH, 0.80 MM, PLASTIC, SSOP-42 |
| 文件页数： | 19/57页 |
| 文件大小： | 856K |
| 代理商： | M38513E4FP |
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23
3851 Group
(Built-in 16 KB ROM)
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Fig. 23 Structure of I2C control register
[I2C Control Register (S1D)] 002E16
The I2C control register (address 002E16) controls data communi-
cation format.
Bits 0 to 2: Bit counter (BC0–BC2)
These bits decide the number of bits for the next 1-byte data to be
transmitted. The I2C interrupt request signal occurs immediately
after the number of count specified with these bits (ACK clock is
added to the number of count when ACK clock is selected by ACK
clock bit (bit 7 of address 002F16)) have been transferred, and
BC0 to BC2 are returned to “0002”.
Also when a START condition is received, these bits become
“0002” and the address data is always transmitted and received in
8 bits.
Bit 3: I2C interface enable bit (ES0)
This bit enables to use the multi-master I2C-BUS interface. When
this bit is set to “0,” the use disable status is provided, so that the
SDA and the SCL become high-impedance. When the bit is set to
“1,” use of the interface is enabled.
When ES0 = “0,” the following is performed.
PIN = “1,” BB = “0” and AL = “0” are set (which are bits of the I2C
status register at address 002D16 ).
Writing data to the I2C data shift register (address 002B16) is dis-
abled.
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 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 “I2C Status Register,” bit 1) is received,
transfer processing can be performed. When this bit is set to “1,”
the free data format is selected, so that slave addresses are not
recognized.
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 I2C address regis-
ter (address 002C16) are compared with address data. When this
bit is set to “1,” the 10-bit addressing format is selected, and all
the bits of the I2C address register are compared with address
data.
Bit 6: SDA/SCL pin selection bit
This bit selects the input/output pins of SCL and SDA of the multi-
master I2C-BUS interface.
Bit 7: I2C-BUS interface pin input level selection bit
This bit selects the input level of the SCL and SDA pins of the
multi-master I2C-BUS interface.
Fig. 22 SDA/SCL pin selection bit
SCL
SDA
Multi-master
I C-BUS interface
2
TSEL
SCL1/P23
SCL2/TxD/P25
SDA1/P22
SDA2/RxD/P24
TSEL
b7
TISS TSEL
10 BIT
SAD
ALS ES0 BC2 BC1 BC0
b0
SDA/SCL pin selection bit
0 : Connect to ports P2 2, P23
1 : Connect to ports P2 4, P25
I2C control register
(S1D : address 002E 16)
Bit counter (Number of
transmit/receive bits)
b2 b1 b0
0
0 : 8
0
1 : 7
0
1
0 : 6
0
1
1 : 5
1
0
0 : 4
1
0
1 : 3
1
0 : 2
1
1 : 1
I2C-BUS interface
enable bit
0 : Disabled
1 : Enabled
Data format selection bit
0 : Addressing format
1 : Free data format
Addressing format
selection bit
0 : 7-bit addressing
format
1 : 10-bit addressing
format
I2C-BUS interface pin input
level selection bit
0 : CMOS input
1 : SMBUS input
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