參數資料
型號： ST72F325C4T6
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP48
封裝： 7 X 7 MM, PLASTIC, TQFP-48
文件頁數： 32/193頁
文件大小： 1802K
代理商： ST72F325C4T6
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ST72325
127/193
I2C BUS INTERFACE (Cont’d)
I2C STATUS REGISTER 1 (SR1)
Read Only
Reset Value: 0000 0000 (00h)
Bit 7 = EVF Event flag.
This bit is set by hardware as soon as an event oc-
curs. It is cleared by software reading SR2 register
in case of error event or as described in Figure 69.
It is also cleared by hardware when the interface is
disabled (PE=0).
0: No event
1: One of the following events has occurred:
– BTF=1 (Byte received or transmitted)
– ADSL=1 (Address matched in Slave mode
while ACK=1)
– SB=1 (Start condition generated in Master
mode)
– AF=1 (No acknowledge received after byte
transmission)
– STOPF=1 (Stop condition detected in Slave
mode)
– ARLO=1 (Arbitration lost in Master mode)
– BERR=1 (Bus error, misplaced Start or Stop
condition detected)
– ADD10=1 (Master has sent header byte)
– Address byte successfully transmitted in Mas-
ter mode.
Bit 6 = ADD10 10-bit addressing in Master mode.
This bit is set by hardware when the master has
sent the first byte in 10-bit address mode. It is
cleared by software reading SR2 register followed
by a write in the DR register of the second address
byte. It is also cleared by hardware when the pe-
ripheral is disabled (PE=0).
0: No ADD10 event occurred.
1: Master has sent first address byte (header)
Bit 5 = TRA Transmitter/Receiver.
When BTF is set, TRA=1 if a data byte has been
transmitted. It is cleared automatically when BTF
is cleared. It is also cleared by hardware after de-
tection of Stop condition (STOPF=1), loss of bus
arbitration (ARLO=1) or when the interface is disa-
bled (PE=0).
0: Data byte received (if BTF=1)
1: Data byte transmitted
Bit 4 = BUSY Bus busy.
This bit is set by hardware on detection of a Start
condition and cleared by hardware on detection of
a Stop condition. It indicates a communication in
progress on the bus. The BUSY flag of the I2CSR1
register is cleared if a Bus Error occurs.
0: No communication on the bus
1: Communication ongoing on the bus
Note:
– The BUSY flag is NOT updated when the inter-
face is disabled (PE=0). This can have conse-
quences when operating in Multimaster mode;
i.e. a second active I2C master commencing a
transfer with an unset BUSY bit can cause a con-
flict resulting in lost data. A software workaround
consists of checking that the I2C is not busy be-
fore enabling the I2C Multimaster cell.
Bit 3 = BTF Byte transfer finished.
This bit is set by hardware as soon as a byte is cor-
rectly received or transmitted with interrupt gener-
ation if ITE=1. It is cleared by software reading
SR1 register followed by a read or write of DR reg-
ister. It is also cleared by hardware when the inter-
face is disabled (PE=0).
– Following a byte transmission, this bit is set after
reception of the acknowledge clock pulse. In
case an address byte is sent, this bit is set only
after the EV6 event (See Figure 69). BTF is
cleared by reading SR1 register followed by writ-
ing the next byte in DR register.
– Following a byte reception, this bit is set after
transmission of the acknowledge clock pulse if
ACK=1. BTF is cleared by reading SR1 register
followed by reading the byte from DR register.
The SCL line is held low while BTF=1.
0: Byte transfer not done
1: Byte transfer succeeded
Bit 2 = ADSL Address matched (Slave mode).
This bit is set by hardware as soon as the received
slave address matched with the OAR register con-
tent or a general call is recognized. An interrupt is
generated if ITE=1. It is cleared by software read-
ing SR1 register or by hardware when the inter-
face is disabled (PE=0).
The SCL line is held low while ADSL=1.
0: Address mismatched or not received
1: Received address matched
70
EVF
ADD10
TRA
BUSY
BTF
ADSL
M/SL
SB
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相關代理商/技術參數
參數描述
ST72F325J4T6 功能描述:8位微控制器 -MCU ST72325 8B MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT
ST72F325J4T6TR 功能描述:8位微控制器 -MCU 8Bit MCU w/16 to 60k Flash/ROM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT
ST72F325J4TC 功能描述:8位微控制器 -MCU 8-bit MCU Flash RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT
ST72F325J4TCE 功能描述:8位微控制器 -MCU 8B MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT
ST72F325J4TCTRE 制造商:STMicroelectronics 功能描述:
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