p89cv51rb2 NXP Semiconductors, p89cv51rb2 Datasheet - Page 54

• Manufacturer Part Number: p89cv51rb2
• Description: P89cv51rb2/rc2/rd2 8-bit 80c51 5 V Low Power 64 Kb Flash Microcontroller With 1 Kb Ram, Spi, 6-clock Cpu With 6/12-clock Peripherals
• Manufacturer: NXP Semiconductors

NXP Semiconductors
P89CV51RB2_RC2_RD2_1
Product data sheet
6.13.1 Clock input options and recommended capacitor values for oscillator
6.13 System clock and clock options
Shown in
amplifier (XTAL1, XTAL2), which can be configured for use as an on-chip oscillator.
When driving the device from an external clock source, XTAL2 should be left disconnected
and XTAL1 should be driven.
At start-up, the external oscillator may encounter a higher capacitive load at XTAL1 due to
interaction between the amplifier and its feedback capacitance. However, the capacitance
will not exceed 15 pF once the external signal meets the V
Resonator manufacturer, supply voltage, and other factors may cause circuit performance
to differ from one application to another. C
each design.
various frequencies.
Table 49.
Resonator
Quartz
Ceramic
Fig 26. Oscillator characteristics (using the on-chip oscillator)
Fig 27. Oscillator characteristics (external clock drive)
Figure 26
Recommended values for C
Table 49
and
Rev. 01 — 5 October 2007
shows the typical values for C
Figure 27
C 2
C 1
oscillator
external
are the input and output of an internal inverting
signal
1
n.c.
and C
P89CV51RB2/RC2/RD2
XTAL2
XTAL1
V
SS
1
and C
2
C
20 pF to 30 pF
40 pF to 50 pF
by crystal type
1
= C
002aaa546
XTAL2
XTAL1
V
2
SS
should be adjusted appropriately for
2
1
and C
IL
002aaa545
2
and V
80C51 with 1 kB RAM, SPI
versus resonator type for
IH
specifications.
© NXP B.V. 2007. All rights reserved.
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