參數(shù)資料
型號: S80C32-44:RD
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 44 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 20/152頁
文件大小: 2528K
116
2486AA–AVR–02/2013
ATmega8(L)
Table 45 shows the COM21:0 bit functionality when the WGM21:0 bits are set to phase correct
PWM mode.
Note:
1. A special case occurs when OCR2 equals TOP and COM21 is set. In this case, the Compare
Match is ignored, but the set or clear is done at TOP. See “Phase Correct PWM Mode” on page
111 for more details
Bit 2:0 – CS22:0: Clock Select
The three clock select bits select the clock source to be used by the Timer/Counter, see Table
Timer/Counter
Register – TCNT2
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. Modifying the counter (TCNT2) while the counter is running,
introduces a risk of missing a Compare Match between TCNT2 and the OCR2 Register.
Output Compare
Register – OCR2
The Output Compare Register contains an 8-bit value that is continuously compared with the
counter value (TCNT2). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC2 pin.
Table 45. Compare Output Mode, Phase Correct PWM Mode
COM21
COM20
Description
0
Normal port operation, OC2 disconnected
01
Reserved
10
Clear OC2 on Compare Match when up-counting. Set OC2 on Compare
Match when downcounting
11
Set OC2 on Compare Match when up-counting. Clear OC2 on Compare
Match when downcounting
Table 46. 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
clk
T
2S/256 (From prescaler)
11
1
clkT2S/1024 (From prescaler)
Bit
765
4321
0
TCNT2[7:0]
TCNT2
Read/Write
R/W
Initial Value
000
0000
0
Bit
765
4321
0
OCR2[7:0]
OCR2
Read/Write
R/W
Initial Value
000
0000
0
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