參數(shù)資料
型號(hào): PIC18F242-I/SP
廠商: Microchip Technology
文件頁數(shù): 39/134頁
文件大?。?/td> 0K
描述: IC MCU FLASH 8KX16 EE A/D 28DIP
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,LVD,POR,PWM,WDT
輸入/輸出數(shù): 23
程序存儲(chǔ)器容量: 16KB(8K x 16)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量: 768 x 8
電壓 - 電源 (Vcc/Vdd): 4.2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 5x10b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-DIP(0.300",7.62mm)
包裝: 管件
配用: DVA18XP280-ND - DEVICE ADAPTER 18F2220 PDIP 28LD
其它名稱: PIC18F242I/SP
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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