P83CL882TSLASH001 datasheet(32/88 Pages) PHILIPS

32 / 88 page

2001 Jun 19

Philips Semiconductors

Product speciﬁcation

80C51 Ultra Low Power (ULP) telephony controller

P83CL882

6.5

Timer 0 and Timer 1 event counters

Timer 0 and Timer 1 can perform the following functions:

• Measure time intervals and pulse durations

• Count events

• Measure CPU speed

• Generate interrupt requests.

Timer 0 and Timer 1 can be programmed independently to

operate in four modes:

Mode 0 8-bit timer or 8-bit counter each with divide-by-32

prescaler.

Mode 1 16-bit time interval or event counter.

Mode 2 8-bit time interval or event counter with automatic

reload upon overflow.

Mode 3 Timer 1 stopped and Timer 0 operates as two

separate counters.

A block diagram of Timer 0 and Timer 1 with possible clock

sources is shown in Fig.15.

Table 37 Timer/counter 0 and Timer/counter 1 related SFRs

SFR

DESCRIPTION

SFR ADDRESS

RESET VALUE

TCON

Timer/counter 0 and Timer/counter 1 Control Register

88H

0000 0000

TMOD

Timer/counter 0 and 1 Mode Control Register

89H

0000 0000

SYSCON

System Control Register

B4H

0000 0000

MGT292

C/T = 0

C/T = 1

TL1

TH1

TH0

C/T = 0

C/T = 1

TL0

TR0

control

GATE

INT0

TR1

GATE

INT1

ROMReq

fper

fpsc

InstrReq

fper

fpsc

control

Fig.15 Timer/counter 0 and 1; clock sources and control logic.

P83CL882T/001 Datasheet(PDF) 32 Page - NXP Semiconductors

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