參數資料
型號： C8051F002R
廠商： Silicon Laboratories Inc
文件頁數： 22/171頁
文件大小： 0K
描述： IC 8051 MCU 32K FLASH 32LQFP
標準包裝： 1
系列： C8051F00x
核心處理器： 8051
芯體尺寸： 8-位
速度： 20MHz
連通性： SMBus（2 線/I²C），SPI，UART/USART
外圍設備： 欠壓檢測/復位，POR，PWM，溫度傳感器，WDT
輸入/輸出數： 8
程序存儲器容量： 32KB（32K x 8）
程序存儲器類型： 閃存
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 3.6 V
數據轉換器： A/D 4x12b; D/A 2x12b
振蕩器型： 內部
工作溫度： -40°C ~ 85°C
封裝/外殼： 32-LQFP
包裝： 剪切帶 (CT)
其它名稱： 336-1002-1
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
Figure 16.4. SMB0CN: SMBus Control Register
R
R/W
Reset Value
BUSY
ENSMB
STA
STO
SI
AA
FTE
TOE
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address:
(bit addressable)
0xC0
Bit7:
BUSY: Busy Status Flag.
0: SMBus is free
1: SMBus is busy
Bit6:
ENSMB: SMBus Enable.
This bit enables/disables the SMBus serial interface.
0: SMBus disabled.
1: SMBus enabled.
Bit5:
STA: SMBus Start Flag.
0: No START condition is transmitted.
1: When operating as a master, a START condition is transmitted if the bus is free. (If the
bus is not free, the START is transmitted after a STOP is received.) If STA is set after one
or more bytes have been transmitted or received and before a STOP is received, a repeated
START condition is transmitted. STO should be explicitly cleared before setting STA to
logic 1.
Bit4:
STO: SMBus Stop Flag.
0: No STOP condition is transmitted.
1: Setting STO to logic 1 causes a STOP condition to be transmitted. When a STOP
condition is received, hardware clears STO to logic 0. If both STA and STO are set, a
STOP condition is transmitted followed by a START condition. In slave mode, setting the
STO flag causes SMBus to behave as if a STOP condition was received.
Bit3:
SI: SMBus Serial Interrupt Flag.
This bit is set by hardware when one of 27 possible SMBus states is entered. (Status code
0xF8 does not cause SI to be set.) When the SI interrupt is enabled, setting this bit causes
the CPU to vector to the SMBus interrupt service routine. This bit is not automatically
cleared by hardware and must be cleared by software.
Bit2:
AA: SMBus Assert Acknowledge Flag.
This bit defines the type of acknowledge returned during the acknowledge cycle on the
SCL line.
0: A “not acknowledge” (high level on SDA) is returned during the acknowledge cycle.
1: An “acknowledge” (low level on SDA) is returned during the acknowledge cycle.
Bit1:
FTE: SMBus Free Timer Enable Bit
0: No timeout when SCL is high
1: Timeout when SCL high time exceeds limit specified by the SMB0CR value.
Bit0:
TOE: SMBus Timeout Enable Bit
0: No timeout when SCL is low.
1: Timeout when SCL low time exceeds limit specified by Timer 3, if enabled.
Rev. 1.7
118
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