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| 型號(hào)： | MQ80C52TXXX-16/883 |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44 |
| 封裝： | CERAMIC, QFP-44 |
| 文件頁(yè)數(shù)： | 207/219頁(yè) |
| 文件大?。?/td> | 7896K |
| 代理商： | MQ80C52TXXX-16/883 |
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86
ATmega8A [DATASHEET]
8159E–AVR–02/2013
mode well suited for power regulation, rectification, and DAC applications. High frequency allows physically small
sized external components (coils, capacitors), hence reduces total system cost.
The PWM resolution for fast PWM can be fixed to 8-, 9-, or 10-bit, or defined by either ICR1 or OCR1A. The mini-
mum 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 fast PWM mode the counter is incremented until the counter value matches either one of the fixed values
0x00FF, 0x01FF, or 0x03FF (WGM13:0 = 5, 6, or 7), the value in ICR1 (WGM13:0 = 14), or the value in OCR1A
(WGM13:0 = 15). The counter is then cleared at the following timer clock cycle. The timing diagram for the fast
PWM mode is shown in Figure 17-7. The figure shows fast 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 single-slope operation.
The diagram includes non-inverted and inverted PWM outputs. The small horizontal line marks on the TCNT1
slopes represent compare matches between OCR1x and TCNT1. The OC1x Interrupt Flag will be set when a
Compare Match occurs.
Figure 17-7. Fast PWM Mode, Timing Diagram
The Timer/Counter Overflow Flag (TOV1) is set each time the counter reaches TOP. In addition the OCF1A or
ICF1 Flag is set at the same timer clock cycle as TOV1 is set when either OCR1A or ICR1 is used for defining the
TOP value. If one of the interrupts are enabled, the interrupt handler routine can be used for updating the TOP and
compare values.
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.
The procedure for updating ICR1 differs from updating OCR1A when used for defining the TOP value. The ICR1
Register is not double buffered. This means that if ICR1 is changed to a low value when the counter is running with
none or a low prescaler value, there is a risk that the new ICR1 value written is lower than the current value of
TCNT1. The result will then be that the counter will miss the Compare Match at the TOP value. The counter will
then have to count to the MAX value (0xFFFF) and wrap around starting at 0x0000 before the Compare Match can
occur. The OCR1A Register, however, is double buffered. This feature allows the OCR1A I/O location to be written
anytime. When the OCR1A I/O location is written the value written will be put into the OCR1A Buffer Register. The
OCR1A Compare Register will then be updated with the value in the Buffer Register at the next timer clock cycle
RFPWM
TOP 1
+
log
2
log
-----------------------------------
=
TCNTn
OCRnx / TOP Update
and TOVn Interrupt Flag
Set and OCnA Interrupt
Flag Set or ICFn
Interrupt Flag Set
(Interrupt on TOP)
1
7
Period
2
3
4
5
6
8
OCnx
(COMnx1:0 = 2)
(COMnx1:0 = 3)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MR80C52EXXX-20SCD | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44 |
| MR80C32-16SHXXX | 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44 |
| MD80C32EXXX-30/883 | 8-BIT, 30 MHz, MICROCONTROLLER, CDIP40 |
| MR80C32E-16SC | 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44 |
| MQ80C52EXXX-20/883D | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQFP44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MQ82370-20 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MQ8238020 | 制造商:Intel 功能描述:CONTROLLER: OTHER |
| MQ82380-20 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MQ82380-20/R | 制造商:Rochester Electronics LLC 功能描述: |
| MQ82592 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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