P89C669 데이터 시트보기 (PDF) - Philips Electronics
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P89C669
Philips Electronics
P89C669 Datasheet PDF : 33 Pages
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Philips Semiconductors
P89C669
80C51 8-bit microcontroller family with extended memory
6.2 Pin description
Table 3: Pin description
Symbol Pin
PLCC LQFP
P0.0 - P0.7 43 - 36 30 - 37
Type
I/O
P1.0 - P1.7 2 - 9
1 - 3, I/O
40 - 44
2
40
I/O
3
41
I
4
42
I
5
43
I/O
6
44
I/O
7
1
I/O
8
2
I/O
9
3
I/O
P2.0 - P2.7 24 - 31 18 - 25 I/O
Description
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.
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.
• P1.0, T2
– Timer/Counter 2 external count input/Clock out
• P1.1, T2EX
– Timer/Counter 2 Reload/Capture/Direction Control
• P1.2, ECI
– External Clock Input to the PCA
• P1.3, CEX0
– Capture/Compare External I/O for PCA module 0
• P1.4, CEX1
– Capture/Compare External I/O for PCA module 1 (with pull-up on pin)
• P1.5, CEX2
– Capture/Compare External I/O for PCA module 2 (with pull-up on pin)
• 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)
• 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)
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.
9397 750 12299
Product data
Rev. 02 — 13 November 2003
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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