P87LPC762FN datasheet(33/57 Pages) PHILIPS

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Philips Semiconductors

Preliminary data

87LPC762

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

microcontroller with 2 kbyte OTP

2001 Oct 26

Mode 1

Mode 1 is the same as Mode 0, except that all 16 bits of the timer

Mode 2

Mode 2 configures the Timer register as an 8-bit Counter (TL1) with

automatic reload, as shown in Figure 26. Overflow from TLn not only

sets TFn, but also reloads TLn with the contents of THn, which must

be preset by software. The reload leaves THn unchanged. Mode 2

operation is the same for Timer 0 and Timer 1.

Mode 3

When Timer 1 is in Mode 3 it is stopped. The effect is the same as

setting TR1 = 0.

Timer 0 in Mode 3 establishes TL0 and TH0 as two separate 8-bit

counters. The logic for Mode 3 on Timer 0 is shown in Figure 27.

TL0 uses the Timer 0 control bits: C/T, GATE, TR0 and pin INT0,

and TF0. TH0 is locked into a timer function (counting machine

cycles) and takes over the use of TR1 and TF1 from Timer 1. Thus,

TH0 now controls the “Timer 1” interrupt.

Mode 3 is provided for applications that require an extra 8-bit timer.

With Timer 0 in Mode 3, an 87LPC762 can look like it has three

Timer/Counters. When Timer 0 is in Mode 3, Timer 1 can be turned

on and off by switching it into and out of its own Mode 3. It can still

be used by the serial port as a baud rate generator, or in any

application not requiring an interrupt.

SU01174

TLn

(8 BITS)

THn

(8 BITS)

OSC/6

OSC/12

OVERFLOW

Tn PIN

TnOE

TOGGLE

CONTROL

C/T = 1

C/T = 0

Tn PIN

TRn

GATE

INTn PIN

INTERRUPT

TFn

Figure 25. Timer/Counter 0 or 1 in Mode 1 (16-Bit Counter)

SU01392

TLn

(8 BITS)

THn

(8 BITS)

OSC/6

OSC/12

OVERFLOW

Tn PIN

TnOE

TOGGLE

CONTROL

C/T = 1

C/T = 0

Tn PIN

TRn

GATE

INTn PIN

INTERRUPT

TFn

RELOAD

Figure 26. Timer/Counter 0 or 1 in Mode 2 (8-Bit Auto-Reload)

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