參數(shù)資料
型號: MR80C32E-16P883
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44
封裝: LCC-44
文件頁數(shù): 143/176頁
文件大?。?/td> 2962K
代理商: MR80C32E-16P883
69
2535J–AVR–08/10
ATtiny13
Figure 11-11. Timer/Counter Timing Diagram, Clear Timer on Compare Match mode, with Pres-
caler (fclk_I/O/8)
11.9 Register Description
11.9.1
TCCR0A – Timer/Counter Control Register A
Bits 7:6 – COM01A: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 11-2 shows the COM0A1:0 bit functionality when the WGM02:0 bits are set to a normal or
CTC mode (non-PWM).
Table 11-3 on page 70 shows the COM0A1:0 bit functionality when the WGM01:0 bits are set to
fast PWM mode.
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
210
COM0A1
COM0A0
COM0B1
COM0B0
WGM01
WGM00
TCCR0A
Read/Write
R/W
R
R/W
Initial Value
0
Table 11-2.
Compare Output Mode, non-PWM Mode
COM01
COM00
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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