參數(shù)資料
型號: MB9AF311NPMC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PQFP100
封裝: 0.50 MM PITCH, PLASTIC, LQFP-100
文件頁數(shù): 106/114頁
文件大小: 1357K
代理商: MB9AF311NPMC
91
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
Figure 15-11 shows the setting of OCF0A and the clearing of TCNT0 in CTC mode and fast PWM mode where OCR0A is
TOP.
Figure 15-11.Timer/Counter Timing Diagram, Clear Timer on Compare Match mode, with Prescaler (fclk_I/O/8)
15.9
Register Description
15.9.1 TCCR0A – Timer/Counter Control Register A
Bits 7:6 – COM0A1:0: Compare Match Output A Mode
These bits control the output compare pin (OC0A) behavior. If one or both of the COM0A1:0 bits are set, the OC0A output
overrides the normal port functionality of the I/O pin it is connected to. However, note that the data direction register (DDR)
bit corresponding to the OC0A pin must be set in order to enable the output driver.
When OC0A is connected to the pin, the function of the COM0A1:0 bits depends on the WGM02:0 bit setting. Table 15-2
shows the COM0A1:0 bit functionality when the WGM02:0 bits are set to a normal or CTC mode (non-PWM).
TOP - 1
clkI/O
(clkI/O/8)
TCNTn
(CTC)
OCRnx
OCFnx
clkTn
TOP
BOTTOM
TOP
BOTTOM + 1
Bit
7
6
5
4
3
2
1
0
COM0A1 COM0A0 COM0B1 COM0B0
––
WGM01 WGM00
TCCR0A
Read/Write
R/W
R
R/W
Initial Value
0
Table 15-2. Compare Output Mode, non-PWM Mode
COM0A1
COM0A0
Description
0
Normal port operation, OC0A disconnected.
0
1
Toggle OC0A on compare match
1
0
Clear OC0A on compare match
1
Set OC0A on compare match
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