AT90PWM3 datasheet(59/361 Pages) ATMEL

59 / 361 page

4317J–AVR–08/10

AT90PWM2/3/2B/3B

;

.org 0xC00

0xC00

RESET: ldi

r16,high(RAMEND); Main program start

0xC01

out

SPH,r16

; Set Stack Pointer to top of RAM

0xC02

ldi

r16,low(RAMEND)

0xC03

out

SPL,r16

0xC04

sei

; Enable interrupts

0xC05

<instr>

xxx

When the BOOTRST Fuse is programmed, the Boot section size set to 2K bytes and the IVSEL

bit in the MCUCR Register is set before any interrupts are enabled, the most typical and general

program setup for the Reset and Interrupt Vector Addresses in AT90PWM2/2B/3/3B is:

Address

Labels Code

Comments

;

.org 0xC00

0xC00

rjmp

RESET

; Reset handler

0xC01

rjmp

PSC2_CAPT

; PSC2 Capture event Handler

0xC02

rjmp

PSC2_EC

; PSC2 End Cycle Handler

...

;

0xC1F

rjmp

SPM_RDY

; Store Program Memory Ready Handler

;

0xC20

RESET: ldi

r16,high(RAMEND); Main program start

0xC21

out

SPH,r16

; Set Stack Pointer to top of RAM

0xC22

ldi

r16,low(RAMEND)

0xC23

out

SPL,r16

0xC24

sei

; Enable interrupts

0xC25

<instr>

xxx

10.1.1

Moving Interrupts Between Application and Boot Space

The MCU Control Register controls the placement of the Interrupt Vector table.

10.1.2

MCU Control Register – MCUCR

• Bit 1 – IVSEL: Interrupt Vector Select

When the IVSEL bit is cleared (zero), the Interrupt Vectors are placed at the start of the Flash

memory. When this bit is set (one), the Interrupt Vectors are moved to the beginning of the Boot

Loader section of the Flash. The actual address of the start of the Boot Flash Section is deter-

mined by the BOOTSZ Fuses. Refer to the section “Boot Loader Support – Read-While-Write

Self-Programming” on page 264 for details. To avoid unintentional changes of Interrupt Vector

tables, a special write procedure must be followed to change the IVSEL bit:

Write the Interrupt Vector Change Enable (IVCE) bit to one.

Within four cycles, write the desired value to IVSEL while writing a zero to IVCE.

Bit

6543

210

SPIPS

–

PUD

–

IVSEL

IVCE

MCUCR

Read/Write

R/W

Initial Value

0000

000

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