參數(shù)資料
型號: PIC18F2520-I/SP
廠商: Microchip Technology
文件頁數(shù): 42/151頁
文件大?。?/td> 0K
描述: IC MCU FLASH 16KX16 28-DIP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 15
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,HLVD,POR,PWM,WDT
輸入/輸出數(shù): 25
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: 閃存
EEPROM 大小: 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 10x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-DIP(0.300",7.62mm)
包裝: 管件
產(chǎn)品目錄頁面: 643 (CN2011-ZH PDF)
配用: MCP3909RD-3PH1-ND - REF DESIGN MCP3909 3PH ENGY MTR
DVA18XP280-ND - DEVICE ADAPTER 18F2220 PDIP 28LD
2011-2012 Microchip Technology Inc.
Preliminary
DS41579C-page 309
PIC16(L)F1782/3
26.6.13.3
Bus Collision During a Stop
Condition
Bus collision occurs during a Stop condition if:
a)
After the SDA pin has been deasserted and
allowed to float high, SDA is sampled low after
the BRG has timed out.
b)
After the SCL pin is deasserted, SCL is sampled
low before SDA goes high.
The Stop condition begins with SDA asserted low.
When SDA is sampled low, the SCL pin is allowed to
float. When the pin is sampled high (clock arbitration),
the Baud Rate Generator is loaded with SSPADD and
counts down to 0. After the BRG times out, SDA is
sampled. If SDA is sampled low, a bus collision has
occurred. This is due to another master attempting to
drive a data ‘0’ (Figure 26-37). If the SCL pin is sampled
low before SDA is allowed to float high, a bus collision
occurs. This is another case of another master
attempting to drive a data ‘0’ (Figure 26-38).
FIGURE 26-38:
BUS COLLISION DURING A STOP CONDITION (CASE 1)
FIGURE 26-39:
BUS COLLISION DURING A STOP CONDITION (CASE 2)
SDA
SCL
BCLIF
PEN
P
SSPIF
TBRG
SDA asserted low
SDA sampled
low after TBRG,
set BCLIF
’0’
SDA
SCL
BCLIF
PEN
P
SSPIF
TBRG
Assert SDA
SCL goes low before SDA goes high,
set BCLIF
’0’
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