AT90S8515 Просмотр технического описания (PDF) - Atmel Corporation

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AT90S8515

8-bit Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

Reset and Interrupt

Handling

The AT90S8515 provides 12 different interrupt sources. These interrupts and the sepa-

rate reset vector each have a separate program vector in the program memory space.

All interrupts are assigned individual enable bits that must be set (one) together with the

I-bit in the Status Register in order to enable the interrupt.

The lowest addresses in the program memory space are automatically defined as the

Reset and Interrupt vectors. The complete list of vectors is shown in Table 2. The list

also determines the priority levels of the different interrupts. The lower the address, the

higher the priority level. RESET has the highest priority, and next is INT0 (the External

Interrupt Request 0), etc.

Table 2. Reset and Interrupt Vectors

Program

Vector No. Address Source

Interrupt Definition

1

$000 RESET

External Reset, Power-on Reset and

Watchdog Reset

2

$001 INT0

External Interrupt Request 0

3

$002 INT1

External Interrupt Request 1

4

$003 TIMER1 CAPT Timer/Counter1 Capture Event

5

$004 TIMER1 COMPA Timer/Counter1 Compare Match A

6

$005 TIMER1 COMPB Timer/Counter1 Compare Match B

7

$006 TIMER1 OVF

Timer/Counter1 Overflow

8

$007 TIMER0, OVF

Timer/Counter0 Overflow

9

$008 SPI, STC

Serial Transfer Complete

10

$009 UART, RX

UART, Rx Complete

11

$00A UART, UDRE

UART Data Register Empty

12

$00B UART, TX

UART, Tx Complete

13

$00C ANA_COMP

Analog Comparator

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 TIM1_CAPT ; Timer1 Capture Handler

$004

rjmp TIM1_COMPA ; Timer1 CompareA Handler

$005

rjmp TIM1_COMPB ; Timer1 CompareB Handler

$006

rjmp TIM1_OVF

; Timer1 Overflow Handler

$007

rjmp TIM0_OVF

; Timer0 Overflow Handler

$008

rjmp SPI_STC

; SPI Transfer Complete Handler

$009

rjmp UART_RXC

; UART RX Complete Handler

$00a

rjmp UART_DRE

; UDR Empty Handler

$00b

rjmp UART_TXC

; UART TX Complete Handler

$00c

rjmp ANA_COMP

; Analog Comparator Handler

;

$00d

MAIN:

ldi r16,high(RAMEND); Main program start

$00e

out SPH,r16

22 AT90S8515

0841G–09/01

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