P89LPC904FD datasheet(2/41 Pages) PHILIPS

2 / 41 page

Philips Semiconductors

P89LPC904

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

Preliminary data

Rev. 02 — 25 June 2004

2 of 41

9397 750 13521

s Serial Flash In-Circuit Programming (ICP) allows simple production coding with

commercial EPROM programmers. Flash security bits prevent reading of sensitive

application programs.

s Watchdog timer with separate on-chip oscillator, requiring no external

components. The Watchdog prescaler is selectable from 8 values.

s Low voltage reset (Brownout detect) allows a graceful system shutdown when

power fails. May optionally be conﬁgured as an interrupt.

s Idle and two different Power-down reduced power modes. Improved wake-up from

Power-down mode (a low interrupt input starts execution). Typical Power-down

current is 1

µA (total Power-down with voltage comparators disabled).

s Active-LOW reset. On-chip power-on reset allows operation without external reset

components. A reset counter and reset glitch suppression circuitry prevent

spurious and incomplete resets. A software reset function is also available.

s Programmable port output conﬁguration options: quasi-bidirectional, open drain,

push-pull, input-only.

s Port ‘input pattern match’ detect. Port 0 may generate an interrupt when the value

of the pins match or do not match a programmable pattern.

s LED drive capability (20 mA) on all port pins. A maximum limit is speciﬁed for the

entire chip.

s Controlled slew rate port outputs to reduce EMI. Outputs have approximately

10 ns minimum ramp times.

s Only power and ground connections are required to operate the P89LPC904

when internal reset option is selected.

s Four interrupt priority levels.

s One keypad interrupt input.

s Second data pointer.

s External clock input.

s Schmitt trigger port inputs.

s Emulation support.

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