Philips Semiconductors

P89C669

80C51 8-bit microcontroller family with extended memory

Product data

Rev. 02 — 13 November 2003

21 of 33

9397 750 12299

© Koninklijke Philips Electronics N.V. 2003. All rights reserved.

[1]

Parameters are valid over operating temperature range unless otherwise specified.

[2]

Load capacitance for port 0, ALE, and PSEN = 100 pF, load capacitance for all other outputs = 80 pF.

[3]

Interfacing the microcontroller to devices with float times up to 45 ns is permitted. This limited bus contention will not cause damage to

Port 0 drivers.

[4]

Parts are tested down to 2 MHz, but are guaranteed to operate down to 0 Hz.

10.1 Explanation of AC symbols

Each timing symbol has five characters. The first character is always ‘t’ ( = time). The

other characters, depending on their positions, indicate the name of a signal or the

logical status of that signal. The designations are:

A — Address

C — Clock

D — Input data

H — Logic level HIGH

I — Instruction (program memory contents)

L — Logic level LOW, or ALE

P — PSEN

Q — Output data

R — RD signal

t — Time

V — Valid

W — WR signal

X — No longer a valid logic level

Z — Float

Table 10:

Symbol

Parameter

Conditions

Input

Output

START condition hold time

≥ 7t

CLCL

> 4.0

µs

SCL LOW time

≥ 8t

CLCL

> 4.7

µs

SCL HIGH time

≥ 7t

CLCL

> 4.0

µs

SCL rise time

≤ 1 µs-

SCL fall time

≤ 0.3 µs

< 0.3

µs

Data set-up time

≥ 250 ns

SDA set-up time

before repeated START

condition

≥ 250 ns

> 1

µs

SDA set-up time

before STOP condition

≥ 250 ns

Data hold time

≥ 0ns

Repeated START set-up

time

≥ 7t

CLCL

> 4.7

µs

STOP condition set-up time

> 4.0

µs

Bus free time

> 4.7

µs

SDA rise time

≤ 1 µs-

SDA fall time

≤ 300 ns

< 0.3

µs