Philips Semiconductors

P89LPC924/925

8-bit microcontrollers with accelerated two-clock 80C51 core

Product data

Rev. 03 — 15 December 2004

42 of 49

9397 750 14471

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

11. Dynamic characteristics

[1]

Parameters are valid over operating temperature range unless otherwise specified. Parts are tested to 2 MHz, but are guaranteed to

operate down to 0 Hz.

Table 9:

AC characteristics

Symbol

Parameter

Conditions

Variable clock

Unit

Min

Max

Min

Max

internal RC oscillator frequency

(nominal f = 7.3728 MHz)

trimmed to

±1%

7.189

7.557

7.189

7.557

MHz

internal Watchdog oscillator

frequency (nominal f = 400 kHz)

320

520

320

520

kHz

oscillator frequency

0

12

-

-

MHz

clock cycle

see Figure 13

83

-

-

-

ns

CLKLP active frequency

0

8

-

-

MHz

Glitch filter

glitch rejection, P1.5/RST pin

-

50

-

50

ns

signal acceptance, P1.5/RST pin

125

-

125

-

ns

glitch rejection, any pin except

P1.5/RST

-

15

-

15

ns

signal acceptance, any pin except

P1.5/RST

50

-

50

-

ns

External clock

HIGH time

see Figure 13

33

33

-

ns

LOW time

see Figure 13

33

33

-

ns

rise time

see Figure 13

-8

-

8

ns

fall time

see Figure 13

-8

-

8

ns

Shift register (UART mode 0)

serial port clock cycle time

-

1333

-

ns

output data set-up to clock rising

edge

-

1083

-

ns

output data hold after clock rising

edge

-

103

ns

input data hold after clock rising edge

-

0

-

0

ns

input data valid to clock rising edge

150

-

150

-

ns