P89LPC932A1 データシートの表示（PDF） - NXP Semiconductors.

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P89LPC932A1

8-bit microcontroller with accelerated two-clock 80C51 core 8 kB 3 V byte-erasable flash with 512-byte data EEPROM

NXP Semiconductors. 

NXP Semiconductors

P89LPC932A1

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

7.2 Enhanced CPU

The P89LPC932A1 uses an enhanced 80C51 CPU which runs at six 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.

7.3 Clocks

7.3.1 Clock definitions

The P89LPC932A1 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 7) and can also be optionally divided to a slower frequency (see

Section 7.8 “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.

7.3.2 CPU clock (OSCCLK)

The P89LPC932A1 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 18 MHz.

7.3.3 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.

7.3.4 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.

7.3.5 High speed oscillator option

This option supports an external crystal in the range of 4 MHz to 18 MHz. Ceramic

resonators are also supported in this configuration.

7.3.6 Clock output

The P89LPC932A1 supports a user-selectable clock output function on the

XTAL2/CLKOUT pin when crystal oscillator is not being used. This condition occurs if

another clock source has been selected (on-chip RC oscillator, watchdog oscillator,

external clock input on X1) and if the RTC is not using the crystal oscillator as its clock

source. This allows external devices to synchronize to the P89LPC932A1. This output is

enabled by the ENCLK bit in the TRIM register.

P89LPC932A1_3

Product data sheet

Rev. 03 — 12 March 2007

© NXP B.V. 2007. All rights reserved.

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