參數(shù)資料
型號： PIC18F452-E/ML
廠商： Microchip Technology
文件頁數(shù)： 39/134頁
文件大?。?/td> 0K
描述： IC MCU FLASH 16KX16 A/D 44QFN
產(chǎn)品培訓(xùn)模塊： Asynchronous Stimulus
標(biāo)準(zhǔn)包裝： 45
系列： PIC® 18F
核心處理器： PIC
芯體尺寸： 8-位
速度： 40MHz
連通性： I²C，SPI，UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，LVD，POR，PWM，WDT
輸入/輸出數(shù)： 34
程序存儲器容量： 32KB（16K x 16）
程序存儲器類型： 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量： 1.5K x 8
電壓 - 電源 (Vcc/Vdd)： 4.2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x10b
振蕩器型： 外部
工作溫度： -40°C ~ 125°C
封裝/外殼： 44-VQFN 裸露焊盤
包裝： 管件
2011 Microchip Technology Inc.
Preliminary
DS41609A-page 227
PIC16(L)F1508/9
21.6.13.2
Bus Collision During a Repeated
Start Condition
During a Repeated Start condition, a bus collision
occurs if:
a)
A low level is sampled on SDAx when SCLx
goes from low level to high level.
b)
SCLx goes low before SDAx is asserted low,
indicating that another master is attempting to
transmit a data ‘1’.
When the user releases SDAx and the pin is allowed to
float high, the BRG is loaded with SSPxADD and
counts down to zero. The SCLx pin is then deasserted
and when sampled high, the SDAx pin is sampled.
If SDAx is low, a bus collision has occurred (i.e., another
master is attempting to transmit a data ‘0’, Figure 21-35).
If SDAx is sampled high, the BRG is reloaded and
begins counting. If SDAx goes from high-to-low before
the BRG times out, no bus collision occurs because no
two masters can assert SDAx at exactly the same time.
If SCLx goes from high-to-low before the BRG times
out and SDAx has not already been asserted, a bus
collision occurs. In this case, another master is
attempting to transmit a data ‘1’ during the Repeated
Start condition, see Figure 21-36.
If, at the end of the BRG time-out, both SCLx and SDAx
are still high, the SDAx pin is driven low and the BRG
is reloaded and begins counting. At the end of the
count, regardless of the status of the SCLx pin, the
SCLx pin is driven low and the Repeated Start
condition is complete.
FIGURE 21-36:
BUS COLLISION DURING A REPEATED START CONDITION (CASE 1)
FIGURE 21-37:
BUS COLLISION DURING REPEATED START CONDITION (CASE 2)
SDAx
SCLx
RSEN
BCLxIF
S
SSPxIF
Sample SDAx when SCLx goes high.
If SDAx = 0, set BCLxIF and release SDAx and SCLx.
Cleared by software
’0’
SDAx
SCLx
BCLxIF
RSEN
S
SSPxIF
Interrupt cleared
by software
SCLx goes low before SDAx,
set BCLxIF. Release SDAx and SCLx.
TBRG
’0’
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC18F452I/L 制造商:Microchip Technology Inc 功能描述:IC 8BIT MCU PIC18F 40MHZ LCC-44 制造商:Microchip Technology Inc 功能描述:IC, 8BIT MCU, PIC18F, 40MHZ, LCC-44; Controller Family/Series:PIC18; Core Size:8bit; No. of I/O's:34; Supply Voltage Min:4.2V; Supply Voltage Max:5.5V; Digital IC Case Style:LCC; No. of Pins:44; Program Memory Size:16 kWords ;RoHS Compliant: Yes
PIC18F452-I/L 功能描述:8位微控制器 -MCU 32KB 1536 RAM 34I/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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC18F452-I/L 制造商:Microchip Technology Inc 功能描述:8BIT FLASH MCU SMD 18F452 PLCC44
PIC18F452-I/ML 功能描述:8位微控制器 -MCU 32KB 1536 RAM 34I/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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC18F452-I/P 功能描述:8位微控制器 -MCU 32KB 1536 RAM 34I/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 最大時鐘頻率:50 MHz 程序存儲器大小: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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