P89LPC920 datasheet(14/45 Pages) PHILIPS

Part #	P89LPC920

Description	8-bit microcontrollers with two-clock 80C51 core 2 kB/4 kB/8 kB 3 V low-power Flash with 256-byte data RAM

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

P89LPC920/921/922

8-bit microcontrollers with two-clock 80C51 core

Product data

Rev. 06 — 21 November 2003

14 of 45

9397 750 12285

8.

Functional description

Remark: Please refer to the

P89LPC920/921/922 User’s Manual for a more detailed

functional description.

8.1 Enhanced CPU

The P89LPC920/921/922 uses an enhanced 80C51 CPU which runs at 6 times the

speed of standard 80C51 devices. A machine cycle consists of two CPU clock cycles,

and most instructions execute in one or two machine cycles.

8.2 Clocks

8.2.1

Clock deﬁnitions

The P89LPC920/921/922 device has several internal clocks as deﬁned below:

OSCCLK — Input to the DIVM clock divider. OSCCLK is selected from one of four

clock sources (see Figure 5) and can also be optionally divided to a slower frequency

(see Section 8.7 “CPU Clock (CCLK) modiﬁcation: DIVM register”).

Note: fOSC is deﬁned as the OSCCLK frequency.

CCLK — CPU clock; output of the clock divider. There are two CCLK cycles per

machine cycle, and most instructions are executed in one to two machine cycles (two

or four CCLK cycles).

RCCLK — The internal 7.373 MHz RC oscillator output.

PCLK — Clock for the various peripheral devices and is CCLK/2

8.2.2

CPU clock (OSCCLK)

The P89LPC920/921/922 provides several user-selectable oscillator options in

generating the CPU clock. This allows optimization for a range of needs from high

precision to lowest possible cost. These options are conﬁgured when the FLASH is

programmed and include an on-chip watchdog oscillator, an on-chip RC oscillator, an

oscillator using an external crystal, or an external clock source. The crystal oscillator

can be optimized for low, medium, or high frequency crystals covering a range from

20 kHz to 12 MHz.

8.2.3

Low speed oscillator option

This option supports an external crystal in the range of 20 kHz to 100 kHz. Ceramic

resonators are also supported in this conﬁguration.

8.2.4

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.

8.2.5

High speed oscillator option

This option supports an external crystal in the range of 4 MHz to 12 MHz. Ceramic

resonators are also supported in this conﬁguration.

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Manufacturer	Part #	Datasheet	Description
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