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参数资料
| 型号： | R5F64601KFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 48 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80 |
| 文件页数： | 72/75页 |
| 文件大小： | 663K |
| 代理商： | R5F64601KFP |
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93
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
Figure 15-11 shows the setting of OCF0A and the clearing of TCNT0 in CTC mode.
Figure 15-11. Timer/Counter timing diagram, Clear Timer on Compare Match mode, with prescaler (f
clk_I/O/8).
15.9
Register description
15.9.1
TCCR0A – Timer/Counter Control Register A
Bit 7 – FOC0A: Force Output Compare A
The FOC0A bit is only active when the WGM00 bit specifies a non-PWM mode. However, for ensuring compatibil-
ity with future devices, this bit must be set to zero when TCCR0A is written when operating in PWM mode. When
writing a logical one to the FOC0A bit, an immediate compare match is forced on the Waveform Generation unit.
The OC0A output is changed according to its COM0A1:0 bits setting. Note that the FOC0A bit is implemented as a
strobe. Therefore it is the value present in the COM0A1:0 bits that determines the effect of the forced compare.
A FOC0A strobe will not generate any interrupt, nor will it clear the timer in CTC mode using OCR0A as TOP.
The FOC0A bit is always read as zero.
Bit 6, 3 – WGM01:0: 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
Note:
1. The CTC0 and PWM0 bit definition names are now obsolete. Use the WGM01:0 definitions. However, the function-
ality and location of these bits are compatible with previous versions of the timer.
OCFnx
OCRnx
TCNTn
(CTC)
TOP
TOP - 1
TOP
BOTTOM
BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O/8)
Bit
7
6
5
4
3
2
1
0
0x24 (0x44)
FOC0A
WGM00
COM0A1
COM0A0
WGM01
CS02
CS01
CS00
TCCR0A
Read/Write
W
R/W
Initial Value
0
Table 15-2.
Waveform Generation mode bit description (1).
Mode
WGM01
(CTC0)
WGM00
(PWM0)
Timer/Counter mode of
Operation
TOP
Update of
OCR0A at
TOV0 Flag Set on
0
Normal
0xFF
Immediate
MAX
10
1
PWM, Phase Correct
0xFF
TOP
BOTTOM
2
1
0
CTC
OCR0A
Immediate
MAX
31
1
Fast PWM0xFF
BOTTOM
MAX
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