Rainbow-electronics AT89C51SND1C Manual do Utilizador descarregar pdf (Página 10)

AT8xC51SND1C

4109E–8051–06/03

Table 13. System Signal Description

Table 14. Power Signal Description

Signal

Name Type Description

Alternate

Function

RST I

Reset Input

Holding this pin high for 64 oscillator periods while the oscillator is

running resets the device. The Port pins are driven to their reset

conditions when a voltage lower than V

is applied, whether or not the

oscillator is running.

This pin has an internal pull-down resistor which allows the device to be

reset by connecting a capacitor between this pin and V

Asserting RST when the chip is in Idle mode or Power-Down mode

returns the chip to normal operation.

TST

Test Input

Test mode entry signal. This pin must be set to V

Signal

Name Type Description

Alternate

Function

VDD PWR

Digital Supply Voltage

Connect these pins to +3V supply voltage.

VSS GND

Circuit Ground

Connect these pins to ground.

AVDD PWR

Analog Supply Voltage

Connect this pin to +3V supply voltage.

AVSS GND

Analog Ground

Connect this pin to ground.

PVDD PWR

PLL Supply voltage

Connect this pin to +3V supply voltage.

PVSS GND

PLL Circuit Ground

Connect this pin to ground.

UVDD PWR

USB Supply Voltage

Connect this pin to +3V supply voltage.

UVSS GND

USB Ground

Connect this pin to ground.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 209 210

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