AT89LP51RB2 datasheet(85/254 Pages) ATMEL

85 / 254 page

3722A–MICRO–10/11

AT89LP51RB2/RC2/IC2 Preliminary

Figure 13-7. Timer/Counter 1 PWM Mode 1

13.6.3

Mode 2 – 8-bit Frequency Generator

Timer n in PWM Mode 2 functions as an 8-bit Auto-Reload timer, the same as normal Mode 2,

with the exception that the output pin Tn is toggled at every TLn overflow (see Figure 13-8 and

Figure 13-9 on page 86). Timer 1 in PWM Mode 2 is identical to Timer 0. PWM Mode 2 can be

used to output a square wave of varying frequency. THn acts as an 8-bit counter. The following

formula gives the output frequency for Timer n in PWM Mode 2.

Note:

In Fast Mode, TPS applies only when the TnX2 bits in CKCON0 are set. TPS always

applies in Compatibility Mode, therefore setting TnX2 in Compatibility Mode will halve

the output frequency.

Figure 13-8. Timer/Counter 1 PWM Mode 2

CLKSYS

TR1

GATE1

INT1 Pin

TL1

(8 Bits)

Control

TH1

(8 Bits)

OCR1

RH1

(8 Bits)

RL1

(8 Bits)

÷TPS

Mode 2:

out

fSYS

2256

THn

–

()

------------------------------------------

TPS

---------------------

CLKSYS

TR1

GATE1

INT1 Pin

TL1

(8 Bits)

Control

TH1

(8 Bits)

÷TPS

AT89LP51RB2 Datasheet(PDF) 85 Page - ATMEL Corporation

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