ATTINY15L View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATTINY15L

8-bit Microcontroller with 1K Byte Flash

Atmel Corporation 

ATtiny15L

ATtiny15L Reset Sources

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

PIN_CHANGE

; Pin change handler

$003

rjmp

TIM1_CMP

; Timer1 compare match

$004

rjmp

TIM1_OVF

; Timer1 overflow handler

$005

rjmp

TIM0_OVF

; Timer0 overflow handler

$006

rjmp

EE_RDY

; EEPROM Ready handler

$007

rjmp

ANA_COMP

; Analog Comparator handler

$008

rjmp

ADC

; ADC Conversion Handler

;

$009

MAIN: <instr> xxx

; Main program start

…

…

…

…

The ATtiny15L has four sources of Reset:

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

Reset threshold (VPOR).

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

more than 500 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 VCC is below the

Brown-out Reset threshold (VBOT).

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 12 shows the reset logic. Table 4

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

the Register File is unchanged by a reset.

13

1187H–AVR–09/07

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