P87LPC760 datasheet(32/56 Pages) PHILIPS

32 / 56 page

Philips Semiconductors

Preliminary data

P87LPC760

Low power, low price, low pin count (14 pin)

microcontroller with 1 kbyte OTP

2002 Mar 07

SU01553

TL1

(5 BITS)

TH1

(8 BITS)

OSC/6

OSC/12

OVERFLOW

CONTROL

TR1

INTERRUPT

TF1

Figure 25. Timer 1 in Mode 0 (13-Bit Timer)

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 (TLn) with

automatic reload, as shown in Figures 28 and 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 slightly different for Timer 0 and

Timer 1 (see Figures 28 and 29).

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, and TF0 as well

as the INT0 pin. 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 P87LPC760 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.

SU01545

TL0

(8 BITS)

TH0

(8 BITS)

OSC/6

OSC/12

OVERFLOW

T0 PIN

T0OE

TOGGLE

CONTROL

C/T = 1

C/T = 0

T0 PIN

TR0

GATE

INT0 PIN

INTERRUPT

TF0

Figure 26. Timer/Counter 0 in Mode 1 (16-Bit Timer/Counter)

SU01546

TL1

(8 BITS)

OSC/6

OSC/12

OVERFLOW

CONTROL

TR1

INTERRUPT

TF1

TH1

(8 BITS)

Figure 27. Timer 1 in Mode 1 (16-Bit Timer)

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