Rainbow-electronics AT89LP214 Manual do Utilizador descarregar pdf (Página 34)

3538A–MICRO–7/06

AT89LP213/214 [Preliminary]

Figure 14-7. Timer/Counter 1 PWM Mode 1

14.5.3 Mode 2 – 8-bit Frequency Generator

Timer 0 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 T0 is toggled at every TL0 overflow (see Figure 14-8).

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. THx acts as an 8-bit counter. The following formula gives the output

frequency for Timer 0 in PWM Mode 2.

Figure 14-8. Timer/Counter 1 PWM Mode 2

Note: {RH0 & RL0}/{RH1 & RL1} are not required by Timer 0/Timer 1 during PWM Mode 2 and may be

used as temporary storage registers.

OSC

TR1

GATE

INT1 Pin

TL1

(8 Bits)

Control

TH1

(8 Bits)

OCR1

RH1

(8 Bits)

RL1

(8 Bits)

÷TPS

Mode 2:

out

Oscillator Frequency

2256

0–()×

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

TPS

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

×=

OSC

TR1

GATE

INT1 Pin

TL1

(8 Bits)

Control

TH1

(8 Bits)

÷TPS

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 89 90

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