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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega328P датащи(PDF) 116 Page - ATMEL Corporation |
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ATmega328P датащи(HTML) 116 Page - ATMEL Corporation |
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116 / 448 page  116 8161D–AVR–10/09 ATmega48PA/88PA/168PA/328P Note: 1. See ”About Code Examples” on page 7. 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 interrupt 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 Regis- ters, 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 register, the main code must disable the interrupts during the 16-bit access. The following code examples show how to do an atomic read of the TCNT1 Register contents. Reading any of the OCR1A/B or ICR1 Registers can be done by using the same principle. 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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