ATMEGA8515-16JUR【PDF 18/257 页】MCU AVR 8KB FLASH 16MHZ 44PLCC

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114

ATmega8515(L)

2512K–AVR–01/10

The Timer/Counter Overflow Flag (TOV1) is set each time the counter reaches BOT-

TOM. When either OCR1A or ICR1 is used for defining the TOP value, the OC1A or

ICF1 Flag is set accordingly at the same timer clock cycle as the OCR1x Registers are

updated with the double buffer value (at TOP). The Interrupt Flags can be used to gen-

erate an interrupt each time the counter reaches the TOP or BOTTOM value.

When changing the TOP value the program must ensure that the new TOP value is

higher or equal to the value of all of the compare registers. If the TOP value is lower

than any of the compare registers, a Compare Match will never occur between the

TCNT1 and the OCR1x. Note that when using fixed TOP values, the unused bits are

masked to zero when any of the OCR1x Registers are written. As the third period shown

in Figure 54 illustrates, changing the TOP actively while the Timer/Counter is running in

the phase correct mode can result in an unsymmetrical output. The reason for this can

be found in the time of update of the OCR1x Register. Since the OCR1x update occurs

at TOP, the PWM period starts and ends at TOP. This implies that the length of the fall-

ing slope is determined by the previous TOP value, while the length of the rising slope is

determined by the new TOP value. When these two values differ the two slopes of the

period will differ in length. The difference in length gives the unsymmetrical result on the

output.

It is recommended to use the phase and frequency correct mode instead of the phase

correct mode when changing the TOP value while the Timer/Counter is running. When

using a static TOP value there are practically no differences between the two modes of

operation.

In phase correct PWM mode, the compare units allow generation of PWM waveforms on

the OC1x pins. Setting the COM1x1:0 bits to 2 will produce a non-inverted PWM and an

inverted PWM output can be generated by setting the COM1x1:0 to 3 (See Table 52 on

page 120). The actual OC1x value will only be visible on the port pin if the data direction

for the port pin is set as output (DDR_OC1x). The PWM waveform is generated by set-

ting (or clearing) the OC1x Register at the Compare Match between OCR1x and TCNT1

when the counter increments, and clearing (or setting) the OC1x Register at Compare

Match between OCR1x and TCNT1 when the counter decrements. The PWM frequency

for the output when using phase correct PWM can be calculated by the following

equation:

The N variable represents the prescaler divider (1, 8, 64, 256, or 1024).

The extreme values for the OCR1x Register represent special cases when generating a

PWM waveform output in the phase correct PWM mode. If the OCR1x is set equal to

BOTTOM the output will be continuously low and if set equal to TOP the output will be

continuously high for non-inverted PWM mode. For inverted PWM the output will have

the opposite logic values. If OCR1A is used to define the TOP value (WGM1 = 11) and

COM1A1:0 = 1, the OC1A Output will toggle with a 50% duty cycle.

OCnxPCPWM

clk_I/O

2 NTOP

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