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您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄25635 > S80C51C-20D (ATMEL CORP) 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQCC44 PDF資料下載

型號(hào)：	S80C51C-20D
廠商：	ATMEL CORP
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQCC44
封裝：	PLASTIC, LCC-44
文件頁(yè)數(shù)：	9/1021頁(yè)
文件大?。?/td>	15196K
代理商：	S80C51C-20D

32072H–AVR32–10/2012

AT32UC3A3

RETS behaves incorrectly when MPU is enabled

RETS behaves incorrectly when MPU is enabled and MPU is configured so that system

stack is not readable in unprivileged mode.

Fix/Workaround

Make system stack readable in unprivileged mode, or return from supervisor mode using

rete instead of rets. This requires:

1. Changing the mode bits from 001 to 110 before issuing the instruction. Updating the

mode bits to the desired value must be done using a single mtsr instruction so it is done

atomically. Even if this step is generally described as not safe in the UC technical reference

manual, it is safe in this very specific case.

2. Execute the RETE instruction.

In the PRAS and PRBS registers, the MxPR fields are only two bits

In the PRAS and PRBS registers, the MxPR fields are only two bits wide, instead of four bits.

The unused bits are undefined when reading the registers.

Fix/Workaround

Mask undefined bits when reading PRAS and PRBS.

Multiply instructions do not work on RevD

All the multiply instructions do not work.

Fix/Workaround

Do not use the multiply instructions.

Privilege violation when using interrupts in application mode with protected system

If the system stack is protected by the MPU and an interrupt occurs in application mode, an

MPU DTLB exception will occur.

Fix/Workaround

Make a DTLB Protection (Write) exception handler which permits the interrupt request to be

handled in privileged mode.

UPCFGn.INTFRQ is irrelevant for isochronous pipe

As a consequence, isochronous IN and OUT tokens are sent every 1 ms (Full Speed), or

every 125uS (High Speed).

Fix/Workaround

For higher polling time, the software must freeze the pipe for the desired period in order to

prevent any "extra" token.

Sleep Mode activation needs additional A to D conversion

If the ADC sleep mode is activated when the ADC is idle the ADC will not enter sleep mode

before after the next AD conversion.

Fix/Workaround

Activate the sleep mode in the mode register and then perform an AD conversion.

ISO7816 info register US_NER cannot be read

The NER register always returns zero.

相關(guān)PDF資料	PDF描述
S80C32XXX-16R	8-BIT, 16 MHz, MICROCONTROLLER, PQCC44
S80C52CXXX-16	8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQCC44
S80C52CXXX-25SHXXX	8-BIT, MROM, 25 MHz, MICROCONTROLLER, PQCC44
S80C32-20SHXXX:D	8-BIT, 20 MHz, MICROCONTROLLER, PQCC44
S80C32-20SHXXX:R	8-BIT, 20 MHz, MICROCONTROLLER, PQCC44

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
S80C51C-25	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S80C51C-30	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S80C51C-36	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S80C51C-L16	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S80C51FA-1	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller

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