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ATTINY2313-20MU データシート(Datasheet) 89 Page - ATMEL Corporation

部品番号. ATTINY2313-20MU
部品情報  8-bit Microcontroller with 2K Bytes In-System Programmable Flash
ダウンロード  231 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
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 89 page
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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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