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型號(hào)：	R80C52EXXX-16D
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44
文件頁(yè)數(shù)：	811/849頁(yè)
文件大小：	12530K
代理商：	R80C52EXXX-16D

32099I–01/2012

AT32UC3L016/32/64

The TWI pins draw current when they are supplied with 3.3V and the part is left unpowered.

Fix/Workaround

PA21, PB04, and PB05 are not 5V tolerant

Pins PA21, PB04, and PB05 are only 3.3V tolerant.

Fix/Workaround

PB04 SMBALERT function should not be used

The SMBALERT function from TWIMS0 should not be selected on pin PB04.

Fix/Workaround

TWIM STOP bit in IMR always reads as zero

The STOP bit in IMR always reads as zero.

Fix/Workaround

Disabled TWIM drives TWD and TWCK low

When the TWIM is disabled, it drives the TWD and TWCK signals with logic level zero. This

can lead to communication problems with other devices on the TWI bus.

Fix/Workaround

Enable the TWIM first and then enable the TWD and TWCK peripheral pins in the GPIO

controller. If it is necessary to disable the TWIM, first disable the TWD and TWCK peripheral

pins in the GPIO controller and then disable the TWIM.

TWIM SR.IDLE goes high immediately when NAK is received

When a NAK is received and there is a non-zero number of bytes to be transmitted,

SR.IDLE goes high immediately and does not wait for the STOP condition to be sent. This

does not cause any problem just by itself, but can cause a problem if software waits for

SR.IDLE to go high and then immediately disables the TWIM by writing a one to CR.MDIS.

Disabling the TWIM causes the TWCK and TWD pins to go high immediately, so the STOP

condition will not be transmitted correctly.

Fix/Workaround

If possible, do not disable the TWIM. If it is absolutely necessary to disable the TWIM, there

must be a software delay of at least two TWCK periods between the detection of

SR.IDLE==1 and the disabling of the TWIM.

TWIM TWALM polarity is wrong

The TWALM signal in the TWIM is active high instead of active low.

Fix/Workaround

Use an external inverter to invert the signal going into the TWIM. When using both TWIM

and TWIS on the same pins, the TWALM cannot be used.

TWIS CR.STREN does not work in deep sleep modes

When the device is in Stop, DeepStop, or Static mode, address reception will not wake

device if both CR.SOAM and CR.STREN are one.

Fix/Workaround

Do not write both CR.STREN and CR.SOAM to one if the device needs to wake from deep

sleep modes.

TWI0.TWCK on PB05 is non-functional

TWI0.TWCK on PB05 is non-functional.

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