參數(shù)資料
型號: C8051F018
廠商: Silicon Laboratories Inc
文件頁數(shù): 151/154頁
文件大?。?/td> 0K
描述: IC 8051 MCU 16K FLASH 64TQFP
標(biāo)準(zhǔn)包裝: 160
系列: C8051F018
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SMBus(2 線/I²C),SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,溫度傳感器,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-TQFP
包裝: 托盤
C8051F018
C8051F019
14. SMBus / I2C Bus
The SMBus serial I/O interface is compliant with the System Management Bus Specification, version 1.1. It is a
two-wire, bi-directional serial bus, which is also compatible with the I
2C serial bus. Reads and writes to the
interface by the system controller are byte oriented with the SMBus interface autonomously controlling the serial
transfer of the data. Data can be transferred at up to 1/8
th of the system clock if desired (this can be faster than
allowed by the SMBus specification, depending on the system clock used). A method of extending the clock-low
duration is used to accommodate devices with different speed capabilities on the same bus.
Two types of data transfers are possible: data transfers from a master transmitter to an addressed slave receiver, and
data transfers from an addressed slave transmitter to a master receiver. The master device initiates both types of
data transfers and provides the serial clock pulses. The SMBus interface may operate as a master or a slave.
Multiple master devices on the same bus are also supported. If two or more masters attempt to initiate a data
transfer simultaneously, an arbitration scheme is employed with a single master always winning the arbitration.
Figure 14.1. SMBus Block Diagram
SFR Bus
Data Path
Control
SFR Bus
Write to
SMB0DAT
SMBUS CONTROL LOGIC
Read
SMB0DAT
SMB0ADR
S
L
V
6
G
C
S
L
V
5
S
L
V
4
S
L
V
3
S
L
V
2
S
L
V
1
S
L
V
0
C
R
O
S
B
A
R
Clock Divide
Logic
SYSCLK
SMB0CR
C
R
7
C
R
6
C
R
5
C
R
4
C
R
3
C
R
2
C
R
1
C
R
0
SCL
FILTER
N
SDA
Control
0000000b
7 MSBs
8
A
B
A=B
8
0
1
2
3
4
5
6
7
SMB0DAT
8
SMB0CN
S
T
A
S
I
A
F
T
E
T
O
E
N
S
M
B
U
S
Y
S
T
O
SMB0STA
S
T
A
4
S
T
A
3
S
T
A
2
S
T
A
1
S
T
A
0
SCL
Control
Status Generation
Arbitration
SCL Synchronization
SCL Generation (Master Mode)
IRQ Generation
S
T
A
5
S
T
A
6
S
T
A
7
A
B
A=B
SMBUS
IRQ
Interrupt
Request
Port I/O
1
0
SDA
FILTER
N
7
Rev. 1.2
96
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