87LPC769 datasheet(34/61 Pages) PHILIPS

34 / 61 page

Philips Semiconductors

Preliminary specification

87LPC769

Low power, low price, low pin count (20 pin)

microcontroller with 4 kB OTP 8-bit A/D, and DAC

2001 Jan 11

Table 9. Sources of Wakeup from Power Down Mode

Wakeup Source

Conditions

External Interrupt 0 or 1

The corresponding interrupt must be enabled.

Keyboard Interrupt

The keyboard interrupt feature must be enabled and properly set up. The corresponding interrupt must be

enabled.

Comparator 1 or 2

The comparator(s) must be enabled and properly set up. The corresponding interrupt must be enabled.

Watchdog Timer Reset

The watchdog timer must be enabled via the WDTE bit in the UCFG1 EPROM configuration byte.

Watchdog Timer Interrupt

The WDTE bit in the UCFG1 EPROM configuration byte must not be set. The corresponding interrupt must

be enabled.

Brownout Detect Reset

The BOD bit in AUXR1 must not be set (brownout detect not disabled). The BOI bit in AUXR1 must not be

set (brownout interrupt disabled).

Brownout Detect Interrupt

The BOD bit in AUXR1 must not be set (brownout detect not disabled). The BOI bit in AUXR1 must be set

(brownout interrupt enabled). The corresponding interrupt must be enabled.

Reset Input

The external reset input must be enabled.

A/D converter

Must use internal RC clock (RCCLK = 1) for A/D converter to work in Power Down mode. The A/D must be

enabled and properly set up. The corresponding interrupt must be enabled.

Some chip functions continue to operate and draw power during

Power Down mode, increasing the total power used during Power

Down. These include the Brownout Detect, Watchdog Timer,

Comparators, and the A/D Converter.

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