AT80F52-20PI 查看數據表（PDF） - Atmel Corporation

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AT80F52-20PI

8-Bit Microcontroller with 8K Bytes QuickFlash™ Memory

Atmel Corporation 

If desired, ALE operation can be disabled by setting bit 0 of

SFR location 8EH. With the bit set, ALE is active only dur-

ing a MOVX or MOVC instruction. Otherwise, the pin is

weakly pulled high. Setting the ALE-disable bit has no

effect if the microcontroller is in external execution mode.

PSEN

Program Store Enable is the read strobe to external pro-

gram memory.

When the AT80F52 is executing code from external pro-

gram memory, PSEN is activated twice each machine

cycle, except that two PSEN activations are skipped during

each access to external data memory.

EA

External Access Enable. EA must be strapped to GND in

order to enable the device to fetch code from external pro-

gram memory locations starting at 0000H up to FFFFH.

Note, however, that if lock bit 1 is programmed, EA will be

internally latched on reset.

EA should be strapped to VCC for internal program execu-

tions.

XTAL1

Input to the inverting oscillator amplifier and input to the

internal clock operating circuit.

XTAL2

Output from the inverting oscillator amplifier.

Table 1. AT80F52 SFR Map and Reset Values

0F8H

0F0H

B

00000000

0E8H

0E0H

ACC

00000000

0D8H

0D0H

0C8H

PSW

00000000

T2CON

00000000

T2MOD

XXXXXX00

RCAP2L

00000000

0C0H

0B8H

0B0H

0A8H

0A0H

98H

90H

88H

80H

IP

XX000000

P3

11111111

IE

0X000000

P2

11111111

SCON

00000000

P1

11111111

TCON

00000000

P0

11111111

SBUF

XXXXXXXX

TMOD

00000000

SP

00000111

TL0

00000000

DPL

00000000

RCAP2H

00000000

TL1

00000000

DPH

00000000

TL2

00000000

TH0

00000000

TH2

00000000

TH1

00000000

0FFH

0F7H

0EFH

0E7H

0DFH

0D7H

0CFH

0C7H

0BFH

0B7H

0AFH

0A7H

9FH

97H

8FH

PCON

0XXX0000

87H

3-18

AT80F52

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