參數(shù)資料
型號(hào)： M37221M6-XXXSP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP42
封裝： 0.600 INCH, PLASTIC, SDIP-42
文件頁(yè)數(shù)： 51/113頁(yè)
文件大小： 1254K
代理商： M37221M6-XXXSP
42
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
M37221M4/M8/MA–XXXSP, M37221M6–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
The precautions when the raead-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 us-
ing 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.
相關(guān)PDF資料
PDF描述
M37221M6H-XXXFP 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDSO42
M37221EASP 8-BIT, OTPROM, 8.1 MHz, MICROCONTROLLER, PDIP42
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
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M37221M8H-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
M37221M8H-XXXSP 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
M37221MAH-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
M37221MAH-XXXSP 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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