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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ATmega162 데이터시트(PDF) 133 Page - ATMEL Corporation |
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ATmega162 데이터시트(HTML) 133 Page - ATMEL Corporation |
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133 / 324 page  133 2513K–AVR–07/09 ATmega162/V Timer/Counter1 – TCNT1H and TCNT1L Timer/Counter3 – TCNT3H and TCNT3L The two Timer/Counter I/O locations (TCNTnH and TCNTnL, combined TCNTn) give direct access, both for read and for write operations, to the Timer/Counter unit 16-bit counter. To ensure that both the high and low bytes are read and written simultaneously when the CPU accesses these registers, the access is performed using an 8-bit temporary high byte register (TEMP). This temporary register is shared by all the other 16-bit registers. See “Accessing 16-bit Registers” on page 109. Modifying the counter (TCNTn) while the counter is running introduces a risk of missing a Com- pare Match between TCNTn and one of the OCRnx Registers. Writing to the TCNTn Register blocks (removes) the Compare Match on the following timer clock for all compare units. Output Compare Register 1 A – OCR1AH and OCR1AL Output Compare Register 1 B – OCR1BH and OCR1BL Output Compare Register 3 A – OCR3AH and OCR3AL Output Compare Register 3 B – OCR3BH and OCR3BL Bit 765 4321 0 TCNT1[15:8] TCNT1H TCNT1[7:0] TCNT1L Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 0000 0 Bit 765 4321 0 TCNT3[15:8] TCNT3H TCNT3[7:0] TCNT3L Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 0000 0 Bit 765 4321 0 OCR1A[15:8] OCR1AH OCR1A[7:0] OCR1AL Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 0000 0 Bit 765 4321 0 OCR1B[15:8] OCR1BH OCR1B[7:0] OCR1BL Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 0000 0 Bit 765 4321 0 OCR3A[15:8] OCR3AH OCR3A[7:0] OCR3AL Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 0000 0 Bit 765 4321 0 OCR3B[15:8] OCR3BH OCR3B[7:0] OCR3BL Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 0000 0 |
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