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參數(shù)資料
| 型號(hào)： | ST72344K4T6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP32 |
| 封裝： | 7 X 7 MM, ROHS COMPLIANT, TQFP-32 |
| 文件頁(yè)數(shù)： | 63/246頁(yè) |
| 文件大?。?/td> | 2016K |
| 代理商： | ST72344K4T6 |
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ST72344xx, ST72345xx
On-chip peripherals
155/246
Note:
In 10-bit addressing mode, to switch the master to Receiver mode, software must generate
a repeated Start condition and resend the header sequence with the least significant bit set
(11110xx1).
Master receiver
Following the address transmission and after SR1 and CR registers have been accessed,
the master receives bytes from the SDA line into the DR register via the internal shift
register. After each byte the interface generates in sequence:
●
Acknowledge pulse if the ACK bit is set
●
EVF and BTF bits are set by hardware with an interrupt if the ITE bit is set.
Then the interface waits for a read of the SR1 register followed by a read of the DR register,
holding the SCL line low (see Figure 69 Transfer sequencing EV7).
To close the communication: before reading the last byte from the DR register, set the STOP
bit to generate the Stop condition. The interface goes automatically back to slave mode
(M/SL bit cleared).
Note:
In order to generate the non-acknowledge pulse after the last received data byte, the ACK
bit must be cleared just before reading the second last data byte.
Master transmitter
Following the address transmission and after SR1 register has been read, the master sends
bytes from the DR register to the SDA line via the internal shift register.
The master waits for a read of the SR1 register followed by a write in the DR register,
holding the SCL line low (see Figure 69 Transfer sequencing EV8).
When the acknowledge bit is received, the interface sets:
●
EVF and BTF bits with an interrupt if the ITE bit is set.
To close the communication: after writing the last byte to the DR register, set the STOP bit to
generate the Stop condition. The interface goes automatically back to slave mode (M/SL bit
cleared).
Error cases
●
BERR: Detection of a Stop or a Start condition during a byte transfer. In this case, the
EVF and BERR bits are set by hardware with an interrupt if ITE is set.
Note that BERR will not be set if an error is detected during the first pulse of each 9-bit
transaction:
Single Master Mode
If a Start or Stop is issued during the first pulse of a 9-bit transaction, the BERR flag will
not be set and transfer will continue however the BUSY flag will be reset. To work
around this, slave devices should issue a NACK when they receive a misplaced Start or
Stop. The reception of a NACK or BUSY by the master in the middle of communication
gives the possibility to re-initiate transmission.
Multimaster Mode
Normally the BERR bit would be set whenever unauthorized transmission takes place
while transfer is already in progress. However, an issue will arise if an external master
generates an unauthorized Start or Stop while the I2C master is on the first pulse of a
9-bit transaction. It is possible to work around this by polling the BUSY bit during I2C
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PDF描述 |
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| ST72344S2T6TR | MICROCONTROLLER, PQFP44 |
| ST72344S4T6 | MICROCONTROLLER, PQFP44 |
| ST72345C4T6TR | MICROCONTROLLER, PQFP48 |
| ST72521AR7T1/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| ST72521R7T5/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST72345 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH UP TO 16K FLASH MEMORY, 10-BIT ADC, TWO 16-BIT TIMERS, TWO I2C, SPI, SCI |
| ST72345-D/RAIS | 功能描述:子卡和OEM板 8 BITS MICROCONTR RoHS:否 制造商:BeagleBoard by CircuitCo 產(chǎn)品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| ST72361 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-bit MCU with Flash or ROM, 10-bit ADC, 5 timers, SPI, 2x LINSCI⑩ |
| ST72361_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-bit MCU with Flash or ROM, 10-bit ADC, 5 timers, SPI, 2x LINSCI⑩ |
| ST72361K6T6 | 制造商:STMicroelectronics 功能描述:ROMLESS MICRO WITH 2 UART - Bulk |
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