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參數(shù)資料
| 型號： | MR80C32-16SHXXX |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44 |
| 文件頁數(shù)： | 208/219頁 |
| 文件大?。?/td> | 7896K |
| 代理商： | MR80C32-16SHXXX |
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87
ATmega8A [DATASHEET]
8159E–AVR–02/2013
the TCNT1 matches TOP. The update is done at the same timer clock cycle as the TCNT1 is cleared and the
TOV1 Flag is set.
Using the ICR1 Register for defining TOP works well when using fixed TOP values. By using ICR1, the OCR1A
Register is free to be used for generating a PWM output on OC1A. However, if the base PWM frequency is actively
changed (by changing the TOP value), using the OCR1A as TOP is clearly a better choice due to its double buffer
feature.
In fast 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 17-3 on page 93. 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 setting (or clearing)
the OC1x Register at the Compare Match between OCR1x and TCNT1, and clearing (or setting) the OC1x Regis-
ter at the timer clock cycle the counter is cleared (changes from TOP to BOTTOM).
The PWM frequency for the output 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 represents special cases when generating a PWM waveform output in
the fast PWM mode. If the OCR1x is set equal to BOTTOM (0x0000) the output will be a narrow spike for each
TOP+1 timer clock cycle. Setting the OCR1x equal to TOP will result in a constant high or low output (depending
on the polarity of the output set by the COM1x1:0 bits.)
A frequency (with 50% duty cycle) waveform output in fast PWM mode can be achieved by setting OC1A to toggle
its logical level on each Compare Match (COM1A1:0 = 1). This applies only if OCR1A is used to define the TOP
value (WGM13:0 = 15). The waveform generated will have a maximum frequency of f
OC1A = fclk_I/O/2 when OCR1A
is set to zero (0x0000). This feature is similar to the OC1A toggle in CTC mode, except the double buffer feature of
the Output Compare unit is enabled in the fast PWM mode.
17.9.4
Phase Correct PWM Mode
The phase correct Pulse Width Modulation or phase correct PWM mode (WGM13:0 = 1, 2, 3, 10, or 11) provides a
high resolution phase correct PWM waveform generation option. The phase correct PWM mode is, like the phase
and frequency correct PWM mode, based on a dual-slope operation. The counter counts repeatedly from BOT-
TOM (0x0000) to TOP and then from TOP to BOTTOM. In non-inverting Compare Output mode, the Output
Compare (OC1x) is cleared on the Compare Match between TCNT1 and OCR1x while upcounting, and set on the
Compare Match while downcounting. In inverting Output Compare mode, the operation is inverted. The dual-slope
operation has lower maximum operation frequency than single slope operation. However, due to the symmetric
feature of the dual-slope PWM modes, these modes are preferred for motor control applications.
The PWM resolution for the phase correct PWM mode can be fixed to 8-, 9-, or 10-bit, or defined by either ICR1 or
OCR1A. The minimum resolution allowed is 2-bit (ICR1 or OCR1A set to 0x0003), and the maximum resolution is
16-bit (ICR1 or OCR1A set to MAX). The PWM resolution in bits can be calculated by using the following equation:
In phase correct PWM mode the counter is incremented until the counter value matches either one of the fixed val-
ues 0x00FF, 0x01FF, or 0x03FF (WGM13:0 = 1, 2, or 3), the value in ICR1 (WGM13:0 = 10), or the value in
OCR1A (WGM13:0 = 11). The counter has then reached the TOP and changes the count direction. The TCNT1
value will be equal to TOP for one timer clock cycle. The timing diagram for the phase correct PWM mode is shown
on Figure 17-8. The figure shows phase correct PWM mode when OCR1A or ICR1 is used to define TOP. The
TCNT1 value is in the timing diagram shown as a histogram for illustrating the dual-slope operation. The diagram
includes non-inverted and inverted PWM outputs. The small horizontal line marks on the TCNT1 slopes represent
fOCnxPWM
f
clk_I/O
N
1
TOP
+
-----------------------------------
=
RPCPWM
TOP 1
+
log
2
log
-----------------------------------
=
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