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參數(shù)資料
| 型號(hào)： | MQ80C52XXX-36/883 |
| 廠商： | ATMEL CORP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44 |
| 封裝： | CERAMIC, QFP-44 |
| 文件頁(yè)數(shù)： | 18/152頁(yè) |
| 文件大小： | 2528K |
| 代理商： | MQ80C52XXX-36/883 |
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114
2486AA–AVR–02/2013
ATmega8(L)
Figure 55 shows the setting of OCF2 and the clearing of TCNT2 in CTC mode.
Figure 55. Timer/Counter Timing Diagram, Clear Timer on Compare Match Mode, with Pres-
caler (f
clk_I/O/8)
8-bit
Timer/Counter
Register
Description
Timer/Counter Control
Register – TCCR2
Bit 7 – FOC2: Force Output Compare
The FOC2 bit is only active when the WGM bits specify a non-PWM mode. However, for ensur-
ing compatibility with future devices, this bit must be set to zero when TCCR2 is written when
operating in PWM mode. When writing a logical one to the FOC2 bit, an immediate Compare
Match is forced on the waveform generation unit. The OC2 output is changed according to its
COM21:0 bits setting. Note that the FOC2 bit is implemented as a strobe. Therefore it is the
value present in the COM21:0 bits that determines the effect of the forced compare.
A FOC2 strobe will not generate any interrupt, nor will it clear the timer in CTC mode using
OCR2 as TOP.
The FOC2 bit is always read as zero.
Bit 6:3 – WGM21:0: Waveform Generation Mode
These bits control the counting sequence of the counter, the source for the maximum (TOP)
counter value, and what type of waveform generation to be used. Modes of operation supported
by the Timer/Counter unit are: Normal mode, Clear Timer on Compare Match (CTC) mode, and
two types of Pulse Width Modulation (PWM) modes. See Table 42 on page 115 and “Modes of
OCFn
OCRn
TCNTn
(CTC)
TOP
TOP - 1
TOP
BOTTOM
BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O/8)
Bit
765
4321
0
FOC2
WGM20
COM21
COM20
WGM21
CS22
CS21
CS20
TCCR2
Read/Write
W
R/W
Initial Value
000
0000
0
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