參數(shù)資料
型號(hào)： AQ80C52XXX-16SHXXX:D
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
封裝： CERAMIC, QFP-44
文件頁數(shù)： 133/134頁
文件大小： 3805K
98
8068U–AVR–06/2013
XMEGA A3
Not recommended for new designs -
Use XMEGA A3U series
22. TWI Transmit collision flag not cleared on repeated start
The TWI transmit collision flag should be automatically cleared on start and repeated start,
but is only cleared on start.
Problem fix/Workaround
Clear the flag in software after address interrupt.
23. Clearing TWI Stop Interrupt Flag may lock the bus
If software clears the STOP Interrupt Flag (APIF) on the same Peripheral Clock cycle as the
hardware sets this flag due to a new address received, CLKHOLD is not cleared and the
SCL line is not released. This will lock the bus.
Problem fix/Workaround
Check if the bus state is IDLE. If this is the case, it is safe to clear APIF. If the bus state is
not IDLE, wait for the SCL pin to be low before clearing APIF.
Code:
/* Only clear the interrupt flag if within a "safe zone". */
while ( /* Bus not IDLE: */
((COMMS_TWI.MASTER.STATUS & TWI_MASTER_BUSSTATE_gm) !=
TWI_MASTER_BUSSTATE_IDLE_gc)) &&
/* SCL not held by slave: */
!(COMMS_TWI.SLAVE.STATUS & TWI_SLAVE_CLKHOLD_bm)
)
{
/* Ensure that the SCL line is low */
if ( !(COMMS_PORT.IN & PIN1_bm) )
break;
}
/* Check for an pending address match interrupt */
if ( !(COMMS_TWI.SLAVE.STATUS & TWI_SLAVE_CLKHOLD_bm) )
{
/* Safely clear interrupt flag */
COMMS_TWI.SLAVE.STATUS |= (uint8_t)TWI_SLAVE_APIF_bm;
}
24. TWI START condition at bus timeout will cause transaction to be dropped
If Bus Timeout is enabled and a timeout occurs on the same Peripheral Clock cycle as a
START is detected, the transaction will be dropped.
Problem fix/Workaround
None.
25. TWI Data Interrupt Flag erroneously read as set
When issuing the TWI slave response command CMD=0b11, it takes 1 Peripheral Clock
cycle to clear the data interrupt flag (DIF). A read of DIF directly after issuing the command
will show the DIF still set.
Problem fix/Workaround
Add one NOP instruction before checking DIF.
相關(guān)PDF資料
PDF描述
AQ80C52XXX-36SHXXX:D 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44
AV80C52CXXX-25SHXXX:RD 8-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP44
AV80C52TXXX-20:D 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44
AT89C5131-TISIM 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDSO28
AT89C51ED2-SLUIM 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AQ8211 制造商:ACUTECH 制造商全稱:ACUTECH 功能描述:Ultra-Low Dropout 500mA Voltage Regulator with Enable
AQ8211AY-M5-18-TRL 制造商:ACUTECH 制造商全稱:ACUTECH 功能描述:Ultra-Low Dropout 500mA Voltage Regulator with Enable
AQ8211AY-M5-25-TRL 制造商:ACUTECH 制造商全稱:ACUTECH 功能描述:Ultra-Low Dropout 500mA Voltage Regulator with Enable
AQ8211AY-M5-33-TRL 制造商:ACUTECH 制造商全稱:ACUTECH 功能描述:Ultra-Low Dropout 500mA Voltage Regulator with Enable
AQ8211AY-M5-AJ-TRL 制造商:ACUTECH 制造商全稱:ACUTECH 功能描述:Ultra-Low Dropout 500mA Voltage Regulator with Enable
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*