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AT90USB646 Datasheet(PDF) 121 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 121 Page - ATMEL Corporation |
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121 / 459 page  121 7593H–AVR–11/08 ATmega32U6/AT90USB64/128 Note: 1. See “About Code Examples” on page 9. The assembly code example returns the TCNTn value in the r17:r16 register pair. The following code examples show how to do an atomic write of the TCNTn Register contents. Writing any of the OCRnA/B/C or ICRn Registers can be done by using the same principle. TIM16_ReadTCNTn: ; Save global interrupt flag in r18,SREG ; Disable interrupts cli ; Read TCNTn into r17:r16 in r16,TCNTnL in r17,TCNTnH ; Restore global interrupt flag out SREG,r18 ret C Code Example(1) unsigned int TIM16_ReadTCNTn( void ) { unsigned char sreg; unsigned int i; /* Save global interrupt flag */ sreg = SREG; /* Disable interrupts */ __disable_interrupt(); /* Read TCNTn into i */ i = TCNTn; /* Restore global interrupt flag */ SREG = sreg; return i; } Assembly Code Example (1) |
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