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| 型號(hào)： | M37281MFH-XXXSP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP52 |
| 封裝： | PLASTIC, SHRINK, DIP-52 |
| 文件頁(yè)數(shù)： | 98/158頁(yè) |
| 文件大?。?/td> | 1472K |
| 代理商： | M37281MFH-XXXSP |
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44
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37281MAH–XXXSP,M37281MFH–XXXSP
M37281MKH–XXXSP,M37281EKSP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
Fig. 8.6.12 Address Data Communication Format
S
Slave address
A
Data
A
Data
A/A
P
R/W
7 bits
“0”
1 to 8 bits
S
Slave address
A
Data
A
Data
A
P
7 bits
“1”
1 to 8 bits
(1) A master-transmitter transmits data to a slave-receiver
S
Slave address
1st 7 bits
A
Data
7 bits
“0”
8 bits
1 to 8 bits
(2) A master-receiver receives data from a slave-transmitter
Slave address
2nd byte
A
Data
A/A
P
1 to 8 bits
S
Slave address
1st 7 bits
A
7 bits
“0”
8 bits
7 bits
(3) A master-transmitter transmits data to a slave-receiver with a 10-bit address
Slave address
2nd byte
Data
1 to 8 bits
Sr
Slave address
1st 7 bits
A
Data
A
P
1 to 8 bits
“1”
(4) A master-receiver receives data from a slave-transmitter with a 10-bit address
S : START condition
P : STOP condition
A : ACK bit
R/W : Read/Write bit
Sr : Restart condition
From master to slave
From slave to master
R/W
8.6.12 Precautions when using multi-master I2C-BUS interface
(1) Read-modify-write instruction
The precautions when the read-modify-write instruction such as SEB,
CLB etc. is executed for each register of the multi-master I2C-BUS
interface are described below.
I2C data shift register (S0)
When executing the read-modify-write instruction for this register
during transfer, data may become a value not intended.
I2C address register (S0D)
When the read-modify-write instruction is executed for this register
at detecting the STOP condition, data may become a value not
______
intended. It is because hardware changes the read/write bit (RBW)
at the above timing.
I2C status register (S1)
Do not execute the read-modify-write instruction for this register
because all bits of this register are changed by hardware.
I2C control register (S1D)
When the read-modify-write instruction is executed for this register
at detecting the START condition or at completing the byte transfer,
data may become a value not intended. Because hardware changes
the bit counter (BC0–BC2) at the above timing.
I2C clock control register (S2)
The read-modify-write instruction can be executed for this register.
(2) START condition generating procedure using multi-master
Procedure example (The necessary conditions of the generating
procedure are described as the following to ).
LDA
—
(Taking out of slave address value)
SEI
(Interrupt disabled)
BBS 5,S1,BUSBUSY
(BB flag confirming and branch process)
BUSFREE:
STA S0
(Writing of slave address value)
LDM #$F0, S1
(Trigger of START condition generating)
CLI
(Interrupt enabled)
BUSBUSY:
CLI
(Interrupt enabled)
Use “STA,” “STX” or “STY” of the zero page addressing instruction
for writing the slave address value to the I2C data shift register.
Use “LDM” instruction for setting trigger of START condition gener-
ating.
Write the slave address value of above and set trigger of START
condition generating of above continuously shown the above
procedure example.
Disable interrupts during the following three process steps:
BB flag confirming
Writing of slave address value
Trigger of START condition generating
When the condition of the BB flag is bus busy, enable interrupts
immediately.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37281MKH-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
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| M372F3280DJ3-C | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:32M x 72 DRAM DIMM with ECC Using 16Mx4, 4K & 8K Refresh, 3.3V |
| M3731 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4 SIRENS & MACHINE GUN 2 LEDS BLINKING |
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