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參數(shù)資料
型號： ATMEGA329V-8MUR
廠商： Atmel
文件頁數(shù)： 27/146頁
文件大?。?/td> 0K
描述： MCU AVR 32K FLASH 8MHZ 64QFN
產(chǎn)品培訓(xùn)模塊： megaAVR Introduction
標(biāo)準(zhǔn)包裝： 4,000
系列： AVR® ATmega
核心處理器： AVR
芯體尺寸： 8-位
速度： 8MHz
連通性： SPI，UART/USART，USI
外圍設(shè)備： 欠壓檢測/復(fù)位，LCD，POR，PWM，WDT
輸入/輸出數(shù)： 54
程序存儲器容量： 32KB（16K x 16）
程序存儲器類型： 閃存
EEPROM 大?。?/td> 1K x 8
RAM 容量： 2K x 8
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 5.5 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-VFQFN 裸露焊盤
包裝： 帶卷 (TR)
其它名稱： ATMEGA329V-8MUR-ND
ATMEGA329V-8MURTR
2010-2012 Microchip Technology Inc.
DS41440C-page 275
PIC16(L)F1825/1829
25.6.5
I2C MASTER MODE REPEATED
START CONDITION TIMING
A Repeated Start condition (Figure 25-27) occurs when
the RSEN bit of the SSPxCON2 register is
programmed high and the Master state machine is no
longer active. When the RSEN bit is set, the SCLx pin
is asserted low. When the SCLx pin is sampled low, the
Baud Rate Generator is loaded and begins counting.
The SDAx pin is released (brought high) for one Baud
Rate Generator count (TBRG). When the Baud Rate
Generator times out, if SDAx is sampled high, the SCLx
pin will be deasserted (brought high). When SCLx is
sampled high, the Baud Rate Generator is reloaded
and begins counting. SDAx and SCLx must be
sampled high for one TBRG. This action is then followed
by assertion of the SDAx pin (SDAx = 0) for one TBRG
while SCLx is high. SCLx is asserted low. Following
this, the RSEN bit of the SSPxCON2 register will be
automatically cleared and the Baud Rate Generator will
not be reloaded, leaving the SDAx pin held low. As
soon as a Start condition is detected on the SDAx and
SCLx pins, the S bit of the SSPxSTAT register will be
set. The SSPxIF bit will not be set until the Baud Rate
Generator has timed out.
FIGURE 25-27:
REPEAT START CONDITION WAVEFORM
Note 1:
If RSEN is programmed while any other
event is in progress, it will not take effect.
2:
A bus collision during the Repeated Start
condition occurs if:
SDAx is sampled low when SCLx
goes from low-to-high.
SCLx goes low before SDAx is
asserted low. This may indicate
that another master is attempting to
transmit a data ‘1’.
SDAx
SCLx
Repeated Start
Write to SSPxCON2
Write to SSPxBUF occurs here
At completion of Start bit,
hardware clears RSEN bit
1st bit
S bit set by hardware
TBRG
SDAx = 1,
SCLx (no change)
SCLx = 1
occurs here
TBRG
and sets SSPxIF
Sr
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