P89C669 datasheet(8/33 Pages) PHILIPS

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Philips Semiconductors

P89C669

80C51 8-bit microcontroller family with extended memory

Product data

Rev. 02 — 13 November 2003

8 of 33

9397 750 12299

6.2 Pin description

Table 3:

Pin description

Symbol

Type

Description

PLCC

LQFP

P0.0 - P0.7

43 - 36

30 - 37

I/O

Port 0: Port 0 is an open drain, bidirectional I/O port. Port 0 pins that have 1s

written to them ﬂoat and can be used as high-impedance inputs. Port 0 is also

the multiplexed low-order address and data bus during accesses to external

program and data memory. In this application, it uses strong internal pull-ups

when emitting 1s.

P1.0 - P1.7

2 - 9

1 - 3,

40-44

I/O

Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups on all pins.

Port 1 pins that have 1s written to them are pulled HIGH by the internal pull-ups

and can be used as inputs. As inputs, Port 1 pins that are externally pulled LOW

will source current because of the internal pull-ups.

I/O

• P1.0, T2

– Timer/Counter 2 external count input/Clock out

341

• P1.1, T2EX

– Timer/Counter 2 Reload/Capture/Direction Control

442

• P1.2, ECI

– External Clock Input to the PCA

I/O

• P1.3, CEX0

– Capture/Compare External I/O for PCA module 0

I/O

• P1.4, CEX1

– Capture/Compare External I/O for PCA module 1 (with pull-up on pin)

I/O

• P1.5, CEX2

– Capture/Compare External I/O for PCA module 2 (with pull-up on pin)

I/O

• P1.6, SCL

– I2C serial clock (when I2C is used, this pin is open-drain and requires

external pull-up due to I2C-bus speciﬁcation)

I/O

• P1.7, SDA

– I2C serial data (when I2C is used, this pin is open-drain and requires

external pull-up due to I2C-bus speciﬁcation)

P2.0 - P2.7

24 - 31

18 - 25

I/O

Port 2: Port 2 is a 8-bit bidirectional I/O port with internal pull-ups. Port 2 pins

that have 1s written to them are pulled HIGH by the internal pull-ups and can be

used as inputs. As inputs, port 2 pins that are externally being pulled LOW will

source current because of the internal pull-ups. (See Section 9 “Static

characteristics”,IIL). Port 2 emits the high-order address byte during fetches from

external program memory and during accesses to external data memory that

use 16-bit addresses (MOVX @ DPTR) or 23-bit addresses (MOVX @EPTR,

EMOV). In this application, it uses strong internal pull-ups when emitting 1s.

During accesses to external data memory that use 8-bit addresses (MOV @ Ri),

port 2 emits the contents of the P2 Special Function Register.

Note that when 23-bit address is used, address bits A16-A22 will be outputted to

P2.0-P2.6 when ALE is HIGH, and address bits A8-A14 are outputted to

P2.0-P2.6 when ALE is LOW. Address bit A15 is outputted on P2.7 regardless of

ALE.

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