AT90PWM2 datasheet(107/365 Pages) ATMEL

107 / 365 page

107

AT90PWM2/3

4317B–AVR–02/05

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 TCNTn 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

n to 0x01FF

ldi

r17,0x01

ldi

r16,0xFF

out

TCNT

nH,r17

out

TCNT

nL,r16

; Read TCNT

n into r17:r16

r16,TCNT

r17,TCNT

...

C Code Examples(1)

unsigned int

...

/* Set TCNT

n to 0x01FF */

TCNT

n = 0x1FF;

/* Read TCNT

n into i */

i = TCNT

...

AT90PWM2 Datasheet(PDF) 107 Page - ATMEL Corporation

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