參數(shù)資料
型號: MR80C52CXXX-36/883:R
廠商: TEMIC SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQCC44
文件頁數(shù): 70/142頁
文件大?。?/td> 25028K
161
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
The three Clock Select bits select the clock source to be used by the Timer/Counter, see Table
17.11.3
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. Modifying the counter (TCNT2) while the counter is running,
introduces a risk of missing a Compare Match between TCNT2 and the OCR2x Registers.
17.11.4
OCR2A – Output Compare Register A
The Output Compare Register A 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 OC2A pin.
17.11.5
OCR2B – Output Compare Register B
The Output Compare Register B 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 OC2B pin.
Table 17-9.
Clock Select bit description.
CS22
CS21
CS20
Description
0
No clock source (Timer/Counter stopped).
001
clkT2S/(No prescaling)
010
clkT2S/8 (From prescaler)
011
clkT2S/32 (From prescaler)
100
clkT2S/64 (From prescaler)
101
clkT2S/128 (From prescaler)
110
clkT2S/256 (From prescaler)
111
clkT2S/1024 (From prescaler)
Bit
76543210
TCNT2[7:0]
TCNT2
Read/Write
R/W
Initial Value
00000000
Bit
76543210
OCR2A[7:0]
OCR2A
Read/Write
R/W
Initial Value
00000000
Bit
76543210
OCR2B[7:0]
OCR2B
Read/Write
R/W
Initial Value
00000000
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