參數(shù)資料
型號(hào)： MQ80C154-L16/883R
廠商： TEMIC SEMICONDUCTORS
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, 16 MHz, MICROCONTROLLER, CQFP44
文件頁(yè)數(shù)： 45/49頁(yè)
文件大?。?/td> 61013K
代理商： MQ80C154-L16/883R
139
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
Table 18-4 shows the COM2A[1:0] bit functionality when the WGM2[1:0] bits are set to fast PWM mode.
Note:
1. A special case occurs when OCR2A equals TOP and COM2A1 is set. In this case, the compare match is ignored,
but the set or clear is done at TOP. See ”Fast PWM Mode” on page 132 for more details.
Table 18-5 shows the COM2A[1:0] bit functionality when the WGM2[1:0] bits are set to phase correct PWM mode.
Note:
1. A special case occurs when OCR2A equals TOP and COM2A1 is set. In this case, the compare match is ignored,
but the set or clear is done at TOP. See ”P(pán)hase Correct PWM Mode” on page 133 for more details.
Bit 2:0 – CS2[2:0]: Clock Select
The three Clock Select bits select the clock source to be used by the Timer/Counter, see Table 18-6.
18.11.2
TCNT2 – Timer/Counter Register
The Timer/Counter Register gives direct access, both for read and write operations, to the Timer/Counter unit 8-bit
counter. Writing to the TCNT2 Register blocks (removes) the compare match on the following timer clock. Modify-
Table 18-4.
Compare Output Mode, Fast PWM Mode
COM2A1
COM2A0
Description
0
Normal port operation, OC2A disconnected.
01
Reserved
1
0
Clear OC2A on compare match, set OC2A at BOTTOM (non-inverting mode).
1
Set OC2A on compare match, clear OC2A at BOTTOM (inverting mode).
Table 18-5.
Compare Output Mode, Phase Correct PWM Mode
COM2A1
COM2A0
Description
0
Normal port operation, OC2A disconnected.
01
Reserved
10
Clear OC2A on compare match when up-counting. Set OC2A on compare match when down
counting.
11
Set OC2A on compare match when up-counting. Clear OC2A on compare match when down
counting.
Table 18-6.
Clock Select Bit description.
CS22
CS21
CS20
Description
0
No clock source (Timer/Counter stopped)
00
1
clkT2S/(No prescaling)
01
0
clkT2S/8 (From prescaler)
01
1
clkT2S/32 (From prescaler)
10
0
clkT2S/64 (From prescaler)
10
1
clkT2S/128 (From prescaler)
11
0
clkT2S/256 (From prescaler)
11
1
clk
T
2S/1024 (From prescaler)
Bit
7654
321
0
(0xB2)
TCNT2[7:0]
TCNT2
Read/Write
R/W
Initial Value
0000
000
0
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