AT89LS8252-12PI Просмотр технического описания (PDF) - Atmel Corporation

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Компоненты Описание

производитель

AT89LS8252-12PI

8-Bit Microcontroller with 8K Bytes Flash

Atmel Corporation 

Pin Configurations

PDIP

(T2) P1.0 1

(T2 EX) P1.1 2

P1.2 3

P1.3 4

(SS) P1.4 5

(MOSI) P1.5 6

(MISO) P1.6 7

(SCK) P1.7 8

RST 9

(RXD) P3.0 10

(TXD) P3.1 11

(INT0) P3.2 12

(INT1) P3.3 13

(T0) P3.4 14

(T1) P3.5 15

(WR) P3.6 16

(RD) P3.7 17

XTAL2 18

XTAL1 19

GND 20

40 VCC

39 P0.0 (AD0)

38 P0.1 (AD1)

37 P0.2 (AD2)

36 P0.3 (AD3)

35 P0.4 (AD4)

34 P0.5 (AD5)

33 P0.6 (AD6)

32 P0.7 (AD7)

31 EA/VPP

30 ALE/PROG

29 PSEN

28 P2.7 (A15)

27 P2.6 (A14)

26 P2.5 (A13)

25 P2.4 (A12)

24 P2.3 (A11)

23 P2.2 (A10)

22 P2.1 (A9)

21 P2.0 (A8)

TQFP

PLCC

(MOSI) P1.5 7

(MISO) P1.6 8

(SCK) P1.7 9

RST 10

(RXD) P3.0 11

NC 12

(TXD) P3.1 13

(INT0) P3.2 14

(INT1) P3.3 15

(T0) P3.4 16

(T1) P3.5 17

39 P0.4 (AD4)

38 P0.5 (AD5)

37 P0.6 (AD6)

36 P0.7 (AD7)

35 EA/VPP

34 NC

33 ALE/PROG

32 PSEN

31 P2.7 (A15)

30 P2.6 (A14)

29 P2.5 (A13)

(MOSI) P1.5 1

(MISO) P1.6 2

(SCK) P1.7 3

RST 4

(RXD) P3.0 5

NC 6

(TXD) P3.1 7

(INT0) P3.2 8

(INT1) P3.3 9

(T0) P3.4 10

(T1) P3.5 11

33 P0.4 (AD4)

32 P0.5 (AD5)

31 P0.6 (AD6)

30 P0.7 (AD7)

29 EA/VPP

28 NC

27 ALE/PROG

26 PSEN

25 P2.7 (A15)

24 P2.6 (A14)

23 P2.5 (A13)

Pin Description

VCC

Supply voltage.

GND

Ground.

Port 0

Port 0 is an 8-bit open drain bidirectional I/O port. As an

output port, each pin can sink eight TTL inputs. When 1s

are written to port 0 pins, the pins can be used as high-

impedance inputs.

Port 0 can also be configured to be the multiplexed low-

order address/data bus during accesses to external pro-

gram and data memory. In this mode, P0 has internal pul-

lups.

Port 0 also receives the code bytes during Flash program-

ming and outputs the code bytes during program verifica-

tion. External pullups are required during program verifica-

tion.

Port 1

Port 1 is an 8-bit bidirectional I/O port with internal pullups.

The Port 1 output buffers can sink/source four TTL inputs.

When 1s are written to Port 1 pins, they are pulled high by

the internal pullups and can be used as inputs. As inputs,

Port 1 pins that are externally being pulled low will source

current (IIL) because of the internal pullups.

Some Port 1 pins provide additional functions. P1.0 and

P1.1 can be configured to be the timer/counter 2 external

count input (P1.0/T2) and the timer/counter 2 trigger input

(P1.1/T2EX), respectively.

2

AT89LS8252

0850C–MICRO–3/06

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