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P87LPC779FDH Datasheet(PDF) 34 Page - NXP Semiconductors |
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P87LPC779FDH Datasheet(HTML) 34 Page - NXP Semiconductors |
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34 / 74 page  Philips Semiconductors P87LPC779 CMOS single-chip 8-bit microcontroller Product data Rev. 02 — 03 May 2004 34 of 74 9397 750 13213 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 8.10 Oscillator The P87LPC779 provides several user selectable oscillator options, allowing optimization for a range of needs from high precision to lowest possible cost. These are configured when the EPROM is programmed. Basic oscillator types that are supported include: low, medium, and high speed crystals, covering a range from 20 kHz to 20 MHz; ceramic resonators; and on-chip RC oscillator. 8.10.1 Low speed oscillator option This option supports an external crystal in the range of 20 kHz to 100 kHz. 8.10.2 Medium speed oscillator option This option supports an external crystal in the range of 100 kHz to 4 MHz. Ceramic resonators are also supported in this configuration. 8.10.3 High speed oscillator option This option supports an external crystal in the range of 4 MHz to 20 MHz. Ceramic resonators are also supported in this configuration. Table 24: KBI - Keyboard interrupt register (address 86H) bit description Bit Symbol Description 7 - When set, enables P0.7 as a cause of a Keyboard Interrupt. 6 - When set, enables P0.6 as a cause of a Keyboard Interrupt. 5 - When set, enables P0.5 as a cause of a Keyboard Interrupt. 4 - When set, enables P0.4 as a cause of a Keyboard Interrupt. 3 - When set, enables P0.3 as a cause of a Keyboard Interrupt. 2 - When set, enables P0.2 as a cause of a Keyboard Interrupt. 1 - When set, enables P0.1 as a cause of a Keyboard Interrupt. 0 - When set, enables P0.0 as a cause of a Keyboard Interrupt. Table 25: Recommended oscillator capacitors for use with the low 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 20 kHz 15 pF 15 pF 33 pF 33 pF 33 pF 47 pF 32 kHz 15 pF 15 pF 33 pF 33 pF 33 pF 47 pF 100 kHz 15 pF 15 pF 33 pF 15 pF 15 pF 33 pF Table 26: Recommended oscillator capacitors for use with the medium 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 100 kHz 33 pF 33 pF 47 pF 33 pF 33 pF 47 pF 1 MHz 15 pF 15 pF 33 pF 15 pF 22 pF 47 pF 4 MHz 15 pF 15 pF 33 pF 15 pF 15 pF 33 pF |
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