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P89LPC932BA

8-bit microcontroller with accelerated two-clock 80C51 core 8 kB Flash with 512-byte data EEPROM and 768-byte RAM

Philips Electronics 

Philips Semiconductors

P89LPC932

8-bit microcontroller with accelerated two-clock 80C51 core

8. Functional description

Remark: Please refer to the P89LPC932 User’s Manual for a more detailed

functional description.

8.1 Enhanced CPU

The P89LPC932 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 P89LPC932 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 6) 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 P89LPC932 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.

9397 750 12379

Product data

Rev. 04 — 06 January 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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