AT90LS4433-4AI datasheet(21/126 Pages) ATMEL

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AT90S/LS4433

1042H–AVR–04/03

The most typical 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

TIM1_CAPT

; Timer1 Capture Handler

$004

rjmp

TIM1_COMP

; Timer1 compare Handler

$005

rjmp

TIM1_OVF

; Timer1 Overflow Handler

$006

rjmp

TIM0_OVF

; Timer0 Overflow Handler

$007

rjmp

SPI_STC;

; SPI Transfer Complete Handler

$008

rjmp

UART_RXC

; UART RX Complete Handler

$009

rjmp

UART_DRE

; UDR Empty Handler

$00a

rjmp

UART_TXC

; UART TX Complete Handler

$00b

rjmp

ADC

; ADC Conversion Complete Interrupt Handler

$00c

rjmp

EE_RDY

; EEPROM Ready Handler

$00d

rjmp

ANA_COMP

; Analog Comparator Handler

;

$00e

MAIN:

ldi

r16,low(RAMEND); Main program start

$00f

out

SP,r16;

$010

<instr>

xxx

;

…

Reset Sources

The AT90S4433 has four 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.

•

Brown-out Reset. The MCU is reset when the supply voltage (V

CC) falls below a

certain voltage.

During Reset, all I/O Registers are then set to their Initial Values, and the program starts

execution 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

placed at these locations. The circuit diagram in Figure 24 shows the Reset Logic. Table

4 and Table 5 define the timing and electrical parameters of the reset circuitry.

AT90LS4433-4AI 数据表(PDF) 21 Page - ATMEL Corporation

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