参数资料
型号: IR83C154TXXX-20
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44
封装: LCC-44
文件页数: 4/91页
文件大小: 19688K
代理商: IR83C154TXXX-20
109
Atmel ATmega16/32/64/M1/C1 [DATASHEET]
7647K–AVR–12/13
Figure 13-12 shows the count sequence close to TOP in various modes. When using phase and frequency correct PWM mode
the OCRnx register is updated at BOTTOM. The timing diagrams will be the same, but TOP should be replaced by BOTTOM,
TOP-1 by BOTTOM+1 and so on. The same renaming applies for modes that set the TOVn Flag at BOTTOM.
Figure 13-12.Timer/Counter Timing Diagram, no Prescaling
Figure 13-13 shows the same timing data, but with the prescaler enabled.
Figure 13-13.Timer/Counter Timing Diagram, with Prescaler (f
clk_I/O/8)
TOP - 1
clkI/O
(clkI/O/1)
TCNTn
(CTC and FPWM)
OCRnx
(Update at TOP)
TCNTn
(PC and PFC PWM)
TOVn (FPWM)
and ICFn
(if used as TOP)
clkTn
TOP
Old OCRnx Value
New OCRnx Value
BOTTOM
BOTTOM + 1
TOP - 1
TOP
TOP - 1
TOP - 2
TOP - 1
TOP
BOTTOM
BOTTOM + 1
TOP - 1
TOP
TOP - 1
TOP - 2
clkI/O
(clkI/O/8)
TCNTn
(CTC and FPWM)
OCRnx
(Update at TOP)
TCNTn
(PC and PFC PWM)
TOVn (FPWM)
and ICFn
(if used as TOP)
clkTn
Old OCRnx Value
New OCRnx Value
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