P87LPC768FD datasheet(40/64 Pages) PHILIPS

40 / 64 page

Philips Semiconductors

Preliminary data

87LPC768

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

with 4 kB OTP 8-bit A/D, Pulse Width Modulator

2001 Aug 06

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 29. 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 30.

TL0 uses the Timer 0 control bits: C/T, GATE, TR0, 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 87LPC768 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 28. Timer/Counter 0 or 1 in Mode 1 (16-Bit Counter)

SU01175

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

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