P83CL781HDH datasheet(10/76 Pages) PHILIPS

Part #	P83CL781HDH

Description	Low voltage 8-bit microcontrollers with UART and I2C-bus

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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10 / 76 page

1997 Mar 14

10

Philips Semiconductors

Product speciﬁcation

Low voltage 8-bit microcontrollers with

UART and I2C-bus

P83CL781; P83CL782

PSEN

29

26

Program Store Enable: Read strobe to external Program Memory. When

executing code out of external Program Memory, PSEN is activated twice each

machine cycle. However, during each access to external Data Memory two

PSEN activations are skipped.

ALE

30

27

Address Latch Enable: Latches the low byte of the address during accesses to

external memory. It is activated every six oscillator periods and may be used for

external timing or clocking purposes.

n.c.

−

28

Not connected.

EA

31

29

External Access: When EA is held HIGH, the CPU executes out of the internal

Program Memory (unless the Program Counter exceeds 3FFFH). When EA is

held LOW, the CPU executes out of external Program Memory regardless of the

value of the program counter.

P0.7/AD7

32

30

• Port 0: 8-bit open-drain bidirectional I/O port (P0.7 to P0.0). As an open-drain

output port it can sink/source 8 LS TTL loads. Port 0 pins that have logic 1s

written to them ﬂoat, and in this state will function as high-impedance inputs.

• Low-order addressing: AD7 to AD0 provide the multiplexed low-order

address and data bus during accesses to external memory. In this application

the pins use the strong internal pull-ups when emitting logic 1s.

P0.6/AD6

33

31

P0.5/AD5

34

32

P0.4/AD4

35

33

P0.3/AD3

36

34

P0.2/AD2

37

35

P0.1/AD1

38

36

P0.0/AD0

39

37

VDD

40

38

Power supply.

n.c.

−

39

Not connected.

SYMBOL

DESCRIPTION

DIP40

QFP44

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P83CL781HDH Datasheet(PDF) 10 Page - NXP Semiconductors

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