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ATTINY2313-20PU データシート(PDF) 89 Page - ATMEL Corporation |
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ATTINY2313-20PU データシート(HTML) 89 Page - ATMEL Corporation |
89 / 231 page 89 ATtiny2313/V 2543I–AVR–04/06 Note: 1. The example code assumes that the part specific header file is included. For I/O Registers located in extended I/O map, “IN”, “OUT”, “SBIS”, “SBIC”, “CBI”, and “SBI” instructions must be replaced with instructions that allow access to extended I/O. Typically “LDS” and “STS” combined with “SBRS”, “SBRC”, “SBR”, and “CBR”. The assembly code example returns the TCNT1 value in the r17:r16 register pair. It is important to notice that accessing 16-bit registers are atomic operations. If an inter- rupt occurs between the two instructions accessing the 16-bit register, and the interrupt code updates the temporary register by accessing the same or any other of the 16-bit timer registers, then the result of the access outside the interrupt will be corrupted. Therefore, when both the main code and the interrupt code update the temporary regis- ter, the main code must disable the interrupts during the 16-bit access. Assembly Code Examples(1) ... ; Set TCNT 1 to 0x01FF ldi r17,0x01 ldi r16,0xFF out TCNT 1H,r17 out TCNT 1L,r16 ; Read TCNT 1 into r17:r16 in r16,TCNT 1L in r17,TCNT 1H ... C Code Examples(1) unsigned int i; ... /* Set TCNT 1 to 0x01FF */ TCNT 1 = 0x1FF; /* Read TCNT 1 into i */ i = TCNT 1; ... |
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