參數(shù)資料
型號(hào): PIC14000
廠商: Microchip Technology Inc.
英文描述: CTV 22C 22#22D SKT RECP
中文描述: 28引腳可編程混合信號(hào)控制器
文件頁數(shù): 55/152頁
文件大?。?/td> 953K
代理商: PIC14000
1996 Microchip Technology Inc.
Preliminary
DS40122B-page 55
PIC14000
7.5.4
SMBus
AND ACCESS.bus
CONSIDERATIONS
PIC14000 is compliant with the SMBus specification
published by Intel. Some key points to note regarding
the bus specifications and how it pertains to the
PIC14000 hardware are listed below:
SMBus has fixed input voltage thresholds.
PIC14000 I/O buffers have programmable levels
that can be selected to be compatible with both
SMBus threshold levels via the SMBus and
SPGND bits in the MISC register.
A mechanism to stretch the I
2
C clock time has
been implemented to support SMBus slave
transactions. The SMHOG bit (MISC<7>) allows
hardware to automatically force and hold the I
2
C
clock line low when a data byte has been
received. This prevents the SMBus master from
overflowing the receive buffer in instances where
the microcontroller may be to busy servicing
higher priority tasks to respond to a I
2
C module
interrupt. Or, if the microcontroller is in SLEEP
mode and needs time to wake-up and respond to
the I
2
C interrupt.
FIGURE 7-18: SMHOG STATE MACHINE
SMHOG = 0
SMHOG=1
SMHOG=0
I
2
CIF = 1
SMHOG=0
S
S
I
2
CIF = 0
I
2
CIF = 0
I
2
CIF = 1
I
2
CIF = 0
I
2
CF=0
I
2
CIF = 1
SCL = 0
SCL = 1
A
B
C
D
E/DRIVE
SCL
LOW
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PIC14000-04/SP 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 14000 SDIL28
PIC14000-04/SS 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O 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