AT89LP216_06 datasheet(33/90 Pages) ATMEL

33 / 90 page

3621A–MICRO–6/06

AT89LP216 [Preliminary]

14.5.1

Mode 0 – 8-bit PWM with 8-bit Logarithmic Prescaler

In Mode 0, TLx acts as a logarithmic prescaler driving 8-bit counter THx (see Figure 14-6). The

PSCx bits in TCONB control the prescaler value. On THx overflow, the duty cycle value in RHx

is transferred to OCRx and the output pin is set high. When the count in THx matches OCRx, the

output pin is cleared low. The following formulas give the output frequency and duty cycle for

Timer 0 in PWM Mode 0. Timer 1 in PWM Mode 0 is identical to Timer 0.

Figure 14-6. Timer/Counter 1 PWM Mode 0

14.5.2

Mode 1 – 8-bit PWM with 8-bit Linear Prescaler

In Mode 1, TLx provides linear prescaling with an 8-bit auto-reload from RLx (see Figure 14-7).

On TLx overflow, TLx is loaded with the value of RLx. THx acts as an 8-bit counter. On THx

overflow, the duty cycle value in RHx is transferred to OCRx and the output pin is set high. When

the count in THx matches OCRx, the output pin is cleared low. The following formulas give the

output frequency and duty cycle for Timer 0 in PWM Mode 1. Timer 1 in PWM Mode 1 is identi-

cal to Timer 0.

Mode 0:

fout

Oscillator Frequency

256

PSC01

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

TPS 1

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

Mode 0:

Duty Cycle %

100

RH0

256

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

OSC

TR1

GATE

INT1 Pin

TL1

(8 Bits)

Control

PSC1

TH1

(8 Bits)

OCR1

RH1

(8 Bits)

÷TPS

Mode 1:

fout

Oscillator Frequency

256

RL0

–

()

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

TPS 1

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

Mode 1:

Duty Cycle %

100

RH0

256

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

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