P87LPC779FDH datasheet(69/74 Pages) PHILIPS

69 / 74 page

Philips Semiconductors

P87LPC779

CMOS single-chip 8-bit microcontroller

Product data

Rev. 02 — 03 May 2004

69 of 74

9397 750 13213

11. Dynamic characteristics

[1]

Applies only to an external clock source, not when a crystal is connected to the X1 and X2 pins.

[2]

Tested at VDD = 5.0 V and room temperature.

[3]

These parameters are characterized but not tested.

[4]

These parameters are for 0

°C to +70 °C

Table 57:

AC electrical characteristics

VDD = 2.7 V to 5.5 V unless otherwise speciﬁed; VSS = 0 V.[1][2][3]

Tamb = −40 °C to +85 °C for extended industrial, unless otherwise speciﬁed.

Symbol

Figure

Parameter

Min

Max

Unit

External Clock

Oscillator frequency (VDD = 4.0 V to 6.0 V)

MHz

Oscillator frequency (VDD = 2.7 V to 6.0 V)

MHz

Clock period and CPU timing cycle

1/fC

-ns

tCLCX

Clock low-time[1]

fosc = 20 MHz

tCLCX

fosc = 10 MHz

tCHCX

Clock high time[1]

fosc = 20 MHz

tCHCX

fosc = 10 MHz

Internal RC Oscillator

fCCAL

On-chip oscillator calibration[2]

fRCOSC = 6 MHz

−1+1

fCTOL

On-chip oscillator tolerance[3][4]

fRCOSC = 6 MHz

−2.5

+2.5

fCTOL1

On-chip oscillator tolerance[3]

fRCOSC = 6 MHz

−25

+25

Shift Register

tXLXL

Serial port clock cycle time

6tC

-ns

tQVXH

Output data setup to clock rising edge

5tC − 133

tXHQX

Output data hold after clock rising edge

1tC − 80

tXHDV

Input data setup to clock rising edge

5tC − 133

tXHDX

Input data hold after clock rising edge

Fig 29. Shift register mode timing.

Valid

tXLXL

002aaa425

Set TI

Set RI

tXHQX

tQVXH

tXHDV

tXHDX

Clock

Output Data

Write to SBUF

Input Data

Clear RI

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