AT90LS8535-4AI datasheet(21/127 Pages) ATMEL

21 / 127 page

AT90S/LS8535

1041H–11/01

The most typical and general program setup for the Reset and Interrupt vector

addresses are:

Address Labels

Code

Comments

$000

rjmp

RESET

; Reset Handler

$001

rjmp

EXT_INT0

; IRQ0 Handler

$002

rjmp

EXT_INT1

; IRQ1 Handler

$003

rjmp

TIM2_COMP

; Timer2 Compare Handler

$004

rjmp

TIM2_OVF

; Timer2 Overflow Handler

$005

rjmp

TIM1_CAPT

; Timer1 Capture Handler

$006

rjmp

TIM1_COMPA

; Timer1 CompareA Handler

$007

rjmp

TIM1_COMPB

; Timer1 CompareB Handler

$008

rjmp

TIM1_OVF

; Timer1 Overflow Handler

$009

rjmp

TIM0_OVF

; Timer0 Overflow Handler

$00a

rjmp

SPI_STC;

; SPI Transfer Complete Handler

$00b

rjmp

UART_RXC

; UART RX Complete Handler

$00c

rjmp

UART_DRE

; UDR Empty Handler

$00d

rjmp

UART_TXC

; UART TX Complete Handler

$00e

rjmp

ADC

; ADC Conversion Complete Interrupt

Handler

$00f

rjmp

EE_RDY

; EEPROM Ready Handler

$010

rjmp

ANA_COMP

; Analog Comparator Handler

$011

MAIN:

ldi

r16, high(RAMEND); Main program start

$012

out

SPH,r16

$013

ldi

r16, low(RAMEND) ;

$014

out

SPL,r16

$015

<instr> xxx

……

…

Reset Sources

The AT90S8535 has three sources of reset:

•

Power-on Reset. The MCU is reset when the supply voltage is below the Power-on

Reset threshold (V

POT).

•

External Reset. The MCU is reset when a low level is present on the RESET pin for

more than 50 ns.

•

Watchdog Reset. The MCU is reset when the Watchdog timer period expires and

the Watchdog is enabled.

During reset, all I/O registers are set to their initial values and the program starts execu-

tion from address $000. The instruction placed in address $000 must be an RJMP

(relative jump) instruction to the reset handling routine. If the program never enables an

interrupt source, the interrupt vectors are not used and regular program code can be

$00C

UART, UDRE

UART Data Register Empty

$00D

UART, TX

UART, Tx Complete

$00E

ADC

ADC Conversion Complete

$00F

EE_RDY

EEPROM Ready

$010

ANA_COMP

Analog Comparator

Table 2. Reset and Interrupt Vectors (Continued)

Vector No.

Program Address

Source

Interrupt Definition

AT90LS8535-4AI Datenblatt(PDF) 21 Page - ATMEL Corporation

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