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參數(shù)資料
| 型號(hào)： | ST92F120JV1T |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | TQFP-64 |
| 文件頁(yè)數(shù)： | 136/313頁(yè) |
| 文件大?。?/td> | 4439K |
| 代理商： | ST92F120JV1T |
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I2C BUS INTERFACE
I2C INTERFACE (Cont’d)
Next, depending on the data direction bit (least
significant bit of the address byte), and after the
generation of an acknowledge, the slave must go
in sending or receiving mode.
In 10-bit mode, after receiving the address se-
quence the slave is always in receive mode. It will
enter transmit mode on receiving a repeated Start
condition followed by the header sequence with
matching address bits and the least significant bit
set (11110xx1).
Slave Receiver
Following the address reception and after I2CSR1
register has been read, the slave receives bytes
from the SDA line into the Shift Register and sends
them to the I2CDR register. After each byte it
generates an acknowledge bit if the I2CCR.ACK
bit is set.
When
the
acknowledge
bit
is
sent,
the
I2CSR1.BTF flag is set and an interrupt is generat-
ed if the I2CCR.ITE bit is set (see Figure 104
Transfer sequencing EV2).
Then the interface waits for a read of the I2CSR1
register followed by a read of the I2CDR register,
or waits for the DMA to complete; both holding
the SCL line low.
Slave Transmitter
Following the address reception and after I2CSR1
register has been read, the slave sends bytes from
the I2CDR register to the SDA line via the internal
shift register.
When the acknowledge bit is received, the
I2CCR.BTF flag is set and an interrupt is
generated if the I2CCR.ITE bit is set (see Figure
104 Transfer sequencing EV3).
The slave waits for a read of the I2CSR1 register
followed by a write in the I2CDR register or waits
for the DMA to complete, both holding the SCL
line low.
Error Cases
– BERR: Detection of a Stop or a Start condition
during a byte transfer.
The I2CSR2.BERR flag is set and an interrupt is
generated if I2CCR.ITE bit is set.
If it is a stop then the state machine is reset.
If it is a start then the state machine is reset and
it waits for the new slave address on the bus.
– AF: Detection of a no-acknowledge bit.
The I2CSR2.AF flag is set and an interrupt is
generated if the I2CCR.ITE bit is set.
Note: In both cases, SCL line is not stretched low;
however, the SDA line, due to possible 0 bits
transmitted last, can remain low. It is then neces-
sary to release both lines by software.
Other Events
– ADSL: Detection of a Start condition after an ac-
knowledge time-slot.
The state machine is reset and starts a new proc-
ess. The I2CSR1.ADSL flag bit is set and an in-
terrupt is generated if the I2CCR.ITE bit is set.
The SCL line is stretched low.
– STOPF: Detection of a Stop condition after an
acknowledge time-slot.
The state machine is reset. Then the
I2CSR2.STOPF flag is set and an interrupt is
generated if the I2CCR.ITE bit is set.
How to release the SDA / SCL lines
Set and subsequently clear the I2CCR.STOP bit
while the I2CSR1.BTF bit is set; then the SDA/
SCL lines are released immediately after the
transfer of the current byte.
This will also reset the state machine; any subse-
quent STOP bit (EV4) will not be detected.
10.7.4.2 I2C Master Mode
To switch from default Slave mode to Master
mode a Start condition generation is needed.
Setting
the
I2CCR.START
bit
while
the
I2CSR1.BUSY bit is cleared causes the interface
to generate a Start condition.
Once the Start condition is generated, the periph-
eral is in master mode (I2CSR1.M/SL=1) and
I2CSR1.SB (Start bit) flag is set and an interrupt is
generated if the I2CCR.ITE bit is set (see Figure
104 Transfer sequencing EV5 event).
The interface waits for a read of the I2CSR1 regis-
ter followed by a write in the I2CDR register with
the Slave address, holding the SCL line low.
9
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| ST92F120V1Q7 | 功能描述:8位微控制器 -MCU Flash 128K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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