P89LPC924 Philips Semiconductors, P89LPC924 Datasheet - Page 17

• Manufacturer Part Number: P89LPC924
• Description: (P89LPC924 / P89LPC925) 8-bit microcontrollers
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 14471
Product data
8.6 CPU Clock (CCLK) wake-up delay
8.7 CPU Clock (CCLK) modification: DIVM register
8.8 Low power select
The P89LPC924/925 has an internal wake-up timer that delays the clock until it
stabilizes depending to the clock source used. If the clock source is any of the three
crystal selections (low, medium and high frequencies) the delay is 992 OSCCLK
cycles plus 60 to 100 s. If the clock source is either the internal RC oscillator,
watchdog oscillator, or external clock, the delay is 224 OSCCLK cycles plus
60 to 100 s.
The OSCCLK frequency can be divided down up to 510 times by configuring a
dividing register, DIVM, to generate CCLK. This feature makes it possible to
temporarily run the CPU at a lower rate, reducing power consumption. By dividing the
clock, the CPU can retain the ability to respond to events that would not exit Idle
mode by executing its normal program at a lower rate. This can also allow bypassing
the oscillator start-up time in cases where Power-down mode would otherwise be
used. The value of DIVM may be changed by the program at any time without
interrupting code execution.
The P89LPC924/925 is designed to run at 18 MHz (CCLK) maximum. However, if
CCLK is 8 MHz or slower, the CLKLP SFR bit (AUXR1.7) can be set to ‘1’ to lower the
power consumption further. On any reset, CLKLP is ‘0’ allowing highest performance
access. This bit can then be set in software if CCLK is running at 8 MHz or slower.
Rev. 03 — 15 December 2004
8-bit microcontrollers with accelerated two-clock 80C51 core
P89LPC924/925
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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