参数资料
型号: MB9AF311MPMC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PQFP80
封装: 0.50 MM PITCH, PLASTIC, LQFP-80
文件页数: 20/114页
文件大小: 1357K
代理商: MB9AF311MPMC
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
116
Figure 16-13 shows the same timing data, but with the prescaler enabled.
Figure 16-13.Timer/Counter Timing Diagram, with Prescaler (fclk_I/O/8)
16.11 Register Description
16.11.1 TCCR1A – Timer/Counter1 Control Register A
Bit 7:6 – COM1A1:0: Compare Output Mode for Channel A
Bit 5:4 – COM1B1:0: Compare Output Mode for Channel B
The COM1A1:0 and COM1B1:0 control the output compare pins (OC1A and OC1B respectively) behavior. If one or both of
the COM1A1:0 bits are written to one, the OC1A output overrides the normal port functionality of the I/O pin it is connected
to. If one or both of the COM1B1:0 bit are written to one, the OC1B 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 OC1A or OC1B pin must
be set in order to enable the output driver.
When the OC1A or OC1B is connected to the pin, the function of the COM1x1:0 bits is dependent of the WGM13:0 bits
setting. Table 16-2 shows the COM1x1:0 bit functionality when the WGM13:0 bits are set to a normal or a CTC mode (non-
PWM).
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
Bit
7
6
5
4
3
210
COM1A1 COM1A0 COM1B1 COM1B0
WGM11
WGM10 TCCR1A
Read/Write
R/W
R
R/W
Initial Value
0
Table 16-2. Compare Output Mode, non-PWM
COM1A1/COM1B1
COM1A0/COM1B0
Description
0
Normal port operation, OC1A/OC1B disconnected.
0
1
Toggle OC1A/OC1B on compare match.
1
0
Clear OC1A/OC1B on compare match (set output to low level).
1
Set OC1A/OC1B on compare match (set output to high level).
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