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P87LPC779 Fiches technique(PDF) 35 Page - NXP Semiconductors

No de pièce P87LPC779
Description  CMOS single-chip 8-bit 80C51 microcontroller with 128-byte data RAM, 8 kB OTP
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

P87LPC779 Fiches technique(HTML) 35 Page - NXP Semiconductors

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Philips Semiconductors
P87LPC779
CMOS single-chip 8-bit microcontroller
Product data
Rev. 02 — 03 May 2004
35 of 74
9397 750 13213
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
8.10.4
On-chip RC oscillator option
The on-chip RC oscillator option has a typical frequency of 6 MHz and can be divided
down for slower operation through the use of the DIVM register. A clock output on the
X2 / P2.0 pin may be enabled when the on-chip RC oscillator is used.
8.10.5
External clock input option
In this configuration, the processor clock is input from an external source driving the
X1 / P2.1 pin. The rate may be from 0 Hz up to 20 MHz when VDD is above 4.5 V and
up to 10 MHz when VDD is below 4.5 V. When the external clock input mode is used,
the X2 / P2.0 pin may be used as a standard port pin. A clock output on the X2 / P2.0
pin may be enabled when the external clock input is used.
8.10.6
Clock output
The P87LPC779 supports a clock output function when either the on-chip RC
oscillator or external clock input options are selected. This allows external devices to
synchronize to the P87LPC779. When enabled, via the ENCLK bit in the P2M1
register, the clock output appears on the X2 / CLKOUT pin whenever the on-chip
oscillator is running, including in Idle mode. The frequency of the clock output is 1
6 of
the CPU clock rate. If the clock output is not needed in Idle mode, it may be turned off
prior to entering Idle, saving additional power. The clock output may also be enabled
when the external clock input option is selected.
Table 27:
Recommended oscillator capacitors for use with the high frequency oscillator option
Oscillator
Frequency
VDD = 2.7 V to 4.5 V
VDD = 4.5 V to 6.0 V
Lower Limit
Optimal Value
Upper Limit
Lower Limit
Optimal Value
Upper Limit
4 MHz
15 pF
33 pF
47 pF
15 pF
33 pF
68 pF
8 MHz
15 pF
15 pF
33 pF
15 pF
33 pF
47 pF
16 MHz
-
-
-
15 pF
15 pF
33 pF
20 MHz
-
-
-
15 pF
15 pF
33 pF
The oscillator must be configured in one of the following modes: Low frequency crystal,
medium frequency crystal, or high frequency crystal.
(1) A series resistor may be required to limit crystal drive levels. This is especially important
for low frequency crystals (see text).
Fig 14. Using the crystal oscillator.
002aaa632
87LPC77x
X1
X2
quartz crystal or
ceramic resonator
[1]


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