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AT89LP428 Datasheet(PDF) 48 Page - ATMEL Corporation

No. de pieza AT89LP428
Descripción Electrónicos  8-bit Microcontroller with 4K/8K Bytes In-System Programmable Flash
PDF  149 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89LP428 Datasheet(HTML) 48 Page - ATMEL Corporation

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48
3654A–MICRO–8/09
AT89LP428/828
11.5.1
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 11-6). 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 11-6. Timer/Counter 1 PWM Mode 0
11.5.2
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 11-7 on
page 49). 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
identical to Timer 0.
Mode 0:
f
OUT
Oscillator Frequency
256
2
PSC0
1
+
×
-------------------------------------------------------
1
TPS
1
+
---------------------
×
=
Duty Cycle %
100
RH0
256
------------
×
=
OSC
TR1
GATE
INT1 Pin
TL1
(8 Bits)
Control
PSC1
TH1
(8 Bits)
OCR1
RH1
(8 Bits)
=
T1
÷TPS
Mode 1:
fOUT
Oscillator Frequency
256
256
RL0
–
()
×
-------------------------------------------------------
1
TPS
1
+
---------------------
×
=
Duty Cycle %
100
RH0
256
------------
×
=



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