參數(shù)資料
型號(hào)： M37221EASP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 8.1 MHz, MICROCONTROLLER, PDIP42
封裝： 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-42
文件頁(yè)數(shù)： 50/112頁(yè)
文件大?。?/td> 1207K
代理商： M37221EASP
42
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
M37221M4H/M6H/M8H/MAH–XXXSP/FP
M37221EASP/FP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
Fig. 8.6.12 Address Data Communication Format
SSlave address
A
DataA
DataA/A
P
R/W
7 bits
“0”
1 to 8 bits
SSlave address
A
Data
AData
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
DataA/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 conditionP : STOP condition
A: ACK bitR/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
Precautions for executing the read-modify-write instructions such as
SEB, and CLB, is for each register of the multi-master I2C-BUS inter-
face are described below.
I2C data shift register (S0)
When executing the read-modify-write instruction for this register
during transfer, data may become an arbitrary value.
I2C address register (S0D)
When the read-modify-write instruction is executed for this register
at detection of the STOP condition, data may become an arbitrary
______
value. It is because hardware changes the read/write bit (RBW) at
the 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 detection of the START condition or at completion the byte trans-
fer, data may become an arbitrary value. Because hardware changes
the bit counter (BC0–BC2) at the timing.
I2C clock control register (S2)
The read-modify-write instruction can be executed for this register.
(2) START condition generation procedure us-
ing multi-master
Procedure example (The necessary conditions for the procedure
are described in to below).
LDA
—
(Take out slave address value)
SEI
(Interrupt disabled)
BBS 5,S1,BUSBUSY
(BB flag confirmation and branch process)
BUSFREE:
STA S0
(Write slave address value)
LDM #$F0, S1
(Trigger START condition generation)
CLI
(Interrupt enabled)
BUSBUSY:
CLI
(Interrupt enabled)
Use “STA,” “STX” or “STY” of the zero page addressing instruc-
tion for writing the slave address value to the I2C data shift register.
Use “LDM” instruction for setting trigger of START condition gen-
eration.
{ Write the slave address value of and set trigger of START con-
dition generation as in continuously as shown in the procedure
example.
Disable interrupts during the following three process steps:
BB flag confirmation
Write of slave address value
Trigger of START condition generation
When the condition of the BB flag is bus busy, enable interrupts
immediately.
相關(guān)PDF資料
PDF描述
M37221M4H-XXXSP 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP42
M37221M8H-XXXFP 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDSO42
M37221M6H-XXXSP 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP42
M37221M6H-XXXFP 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDSO42
M37221EASP 8-BIT, OTPROM, 8.1 MHz, MICROCONTROLLER, PDIP42
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M37221EF 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER
M37221EFSP 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER
M37221FP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER
M37221M4H 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER
M37221M4H-XXXFP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER
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