AT80C32X2 查看數據表（PDF） - Atmel Corporation

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AT80C32X2

8-bit Microcontroller 8 Kbytes ROM/OTP, ROMless

Atmel Corporation 

TS8xCx2X2

Mnemonic

Pin Number

DIL LCC

13 15

VQFP

1.4

9

14 16

10

15 17

11

16 18

12

17 19

13

Reset

9 10

4

ALE/PROG 30 33

27

PSEN

29 32

26

EA/VPP

31 35

29

XTAL1

19 21

15

Type Name and Function

I INT1 (P3.3): External interrupt 1

I T0 (P3.4): Timer 0 external input

I T1 (P3.5): Timer 1 external input

O WR (P3.6): External data memory write strobe

O RD (P3.7): External data memory read strobe

I Reset: A high on this pin for two machine cycles while the

oscillator is running, resets the device. An internal diffused

resistor to VSS permits a power-on reset using only an

external capacitor to VCC.

O (I)

Address Latch Enable/Program Pulse: Output pulse for

latching the low byte of the address during an access to

external memory. In normal operation, ALE is emitted at a

constant rate of 1/6 (1/3 in X2 mode) the oscillator frequency,

and can be used for external timing or clocking. Note that one

ALE pulse is skipped during each access to external data

memory. This pin is also the program pulse input (PROG)

during EPROM programming. ALE can be disabled by setting

SFR’s AUXR.0 bit. With this bit set, ALE will be inactive

during internal fetches.

O Program Store ENable: The read strobe to external program

memory. When executing code from the external program

memory, PSEN is activated twice each machine cycle, except

that two PSEN activations are skipped during each access to

external data memory. PSEN is not activated during fetches

from internal program memory.

I External Access Enable/Programming Supply Voltage:

EA must be externally held low to enable the device to fetch

code from external program memory locations 0000H and

3FFFH (RB) or 7FFFH (RC), or FFFFH (RD). If EA is held

high, the device executes from internal program memory

unless the program counter contains an address greater than

3FFFH (RB) or 7FFFH (RC) EA must be held low for

ROMless devices. This pin also receives the 12.75V

programming supply voltage (VPP) during EPROM

programming. If security level 1 is programmed, EA will be

internally latched on Reset.

I Crystal 1: Input to the inverting oscillator amplifier and input

to the internal clock generator circuits.

XTAL2

18 20

14

O Crystal 2: Output from the inverting oscillator amplifier

7

4184I–8051–02/08

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