P89LPC906FD datasheet(34/51 Pages) PHILIPS

34 / 51 page

Philips Semiconductors

P89LPC906/907/908

8-bit microcontrollers with two-clock 80C51 core

Product data

Rev. 05 — 17 December 2004

34 of 51

9397 750 14467

Reset can be triggered from the following sources:

• External reset pin (during power-up or if user conﬁgured via UCFG1. This option

must be used for an oscillator frequency above 12 MHz (P89LPC906).)

• Power-on detect

• Brownout detect

• Watchdog Timer

• Software reset

• UART break character detect reset (P89LPC908).

For every reset source, there is a ﬂag in the Reset Register, RSTSRC. The user can

read this register to determine the most recent reset source. These ﬂag bits can be

cleared in software by writing a ‘0’ to the corresponding bit. More than one ﬂag bit

may be set:

• During a power-on reset, both POF and BOF are set but the other ﬂag bits are

cleared.

• For any other reset, previously set ﬂag bits that have not been cleared will remain

set.

8.15 Timers/counters 0 and 1

The P89LPC906/907/908 has two general purpose timers which are similar to the

standard 80C51 Timer 0 and Timer 1. These timers have four operating modes

(modes 0, 1, 2, and 3). Modes 0, 1, and 2 are the same for both Timers. Mode 3 is

different. And additional PWM output mode, Mode 6, is provided on the P89LPC907.

8.15.1

Mode 0

Putting either Timer into Mode 0 makes it look like an 8048 Timer, which is an 8-bit

Counter with a divide-by-32 prescaler. In this mode, the Timer register is conﬁgured

as a 13-bit register. Mode 0 operation is the same for Timer 0 and Timer 1.

8.15.2

Mode 1

Mode 1 is the same as Mode 0, except that all 16 bits of the timer register are used.

8.15.3

Mode 2

Mode 2 conﬁgures the Timer register as an 8-bit Counter with automatic reload.

Mode 2 operation is the same for Timer 0 and Timer 1.

8.15.4

Mode 3

When Timer 1 is in Mode 3 it is stopped. Timer 0 in Mode 3 forms two separate 8-bit

counters and is provided for applications that require an extra 8-bit timer. When

Timer 1 is in Mode 3 it can still be used by the serial port as a baud rate generator for

the P89LPC907 and P89LPC908.

8.15.5

Mode 6 (P89LPC907)

In this mode, the corresponding timer can be changed to a PWM with a full period of

256 timer clocks.

P89LPC906FD датащи(PDF) 34 Page - NXP Semiconductors

P89LPC906FD датащи(HTML) 34 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

датащи скачать

ссылки URL