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型號(hào)：	MQ83C154TXXX-16P883
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
文件頁(yè)數(shù)：	12/839頁(yè)
文件大?。?/td>	61013K
代理商：	MQ83C154TXXX-16P883

ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]

8285E–AVR–02/2013

Figure 16-6. CTC Mode, timing diagram.

An interrupt can be generated at each time the counter value reaches the TOP value by either using the OCF1A or

ICF1 Flag according to the register used to define the TOP value. If the interrupt is enabled, the interrupt handler

routine can be used for updating the TOP value. However, changing the TOP to a value close to BOTTOM when

the counter is running with none or a low prescaler value must be done with care since the CTC mode does not

have the double buffering feature. If the new value written to OCR1A or ICR1 is lower than the current value of

TCNT1, the counter will miss the compare match. The counter will then have to count to its maximum value

(0xFFFF) and wrap around starting at 0x0000 before the compare match can occur. In many cases this feature is

not desirable. An alternative will then be to use the fast PWM mode using OCR1A for defining TOP (WGM13:0 =

15) since the OCR1A then will be double buffered.

For generating a waveform output in CTC mode, the OC1A output can be set to toggle its logical level on each

compare match by setting the Compare Output mode bits to toggle mode (COM1A1:0 = 1). The OC1A value will

not be visible on the port pin unless the data direction for the pin is set to output (DDR_OC1A = 1). The waveform

generated will have a maximum frequency of f

OC1A = fclk_I/O/2 when OCR1A is set to zero (0x0000). The waveform

frequency is defined by the following equation:

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

As for the Normal mode of operation, the TOV1 Flag is set in the same timer clock cycle that the counter counts

from MAX to 0x0000.

Fast PWM Mode

The fast Pulse Width Modulation or fast PWM mode (WGM13:0 = 5, 6, 7, 14, or 15) provides a high frequency

PWM waveform generation option. The fast PWM differs from the other PWM options by its single-slope operation.

The counter counts from BOTTOM to TOP then restarts from BOTTOM. In non-inverting Compare Output mode,

the Output Compare (OC1x) is cleared on the compare match between TCNT1 and OCR1x, and set at BOTTOM.

In inverting Compare Output mode output is set on compare match and cleared at BOTTOM. Due to the single-

slope operation, the operating frequency of the fast PWM mode can be twice as high as the phase correct and

phase and frequency correct PWM modes that use dual-slope operation. This high frequency makes the fast PWM

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:

OCnA Interrupt Flag Set

or ICFn Interrupt Flag Set

(Interrupt on TOP)

(COMnA1:0 = 1)

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

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

相關(guān)PDF資料	PDF描述
MQ83C154TXXX-L16P883	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
MQ83C154XXX-L16P883D	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
MR83C154CXXX-20/883	8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44
MQ83C154CXXX-25P883	8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQFP44
MR83C154TXXX-30/883D	8-BIT, MROM, 30 MHz, MICROCONTROLLER, CQCC44

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