SAM7X512 查看數據表（PDF） - Atmel Corporation

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SAM7X512

AT91SAM ARM-based Flash MCU

Atmel Corporation 

6.5 PIO Controller Lines

All the I/O lines, PA0 to PA30 and PB0 to PB30, are 5V-tolerant and all integrate a programma-

ble pull-up resistor. Programming of this pull-up resistor is performed independently for each I/O

line through the PIO controllers.

5V-tolerant means that the I/O lines can drive voltage level according to VDDIO, but can be

driven with a voltage of up to 5.5V. However, driving an I/O line with a voltage over VDDIO while

the programmable pull-up resistor is enabled will create a current path through the pull-up resis-

tor from the I/O line to VDDIO. Care should be taken, in particular at reset, as all the I/O lines

default to input with pull-up resistor enabled at reset.

6.6 I/O Lines Current Drawing

The PIO lines PA0 to PA3 are high-drive current capable. Each of these I/O lines can drive up to

16 mA permanently.

The remaining I/O lines can draw only 8 mA.

However, the total current drawn by all the I/O lines cannot exceed 200 mA.

14 SAM7X512/256/128 Summary

6120GS–ATARM–07-Apr-11

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