attiny15l ATMEL Corporation, attiny15l Datasheet - Page 13

• Manufacturer Part Number: attiny15l
• Description: Attiny15l 8-bit Microcontroller With 1k Byte Flash
• Manufacturer: ATMEL Corporation

ATtiny15L Reset Sources
1187H–AVR–09/07
The most typical and general program setup for the Reset and Interrupt Vector
Addresses are:
The ATtiny15L has four sources of Reset:
•
•
•
•
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.
Address
$000
$001
$002
$003
$004
$005
$006
$007
$008
;
$009
Power-on Reset. The MCU is reset when the supply voltage is below the Power-on
Reset threshold (V
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 V
Brown-out Reset threshold (V
…
Labels
MAIN:
…
POR
Code
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
<instr>
).
…
BOT
xxx
RESET
EXT_INT0
PIN_CHANGE
TIM1_CMP
TIM1_OVF
TIM0_OVF
EE_RDY
ANA_COMP
ADC
…
).
Comments
; Reset handler
; IRQ0 handler
; Pin change handler
; Timer1 compare match
; Timer1 overflow handler
; Timer0 overflow handler
; EEPROM Ready handler
; Analog Comparator handler
; ADC Conversion Handler
; Main program start
CC
ATtiny15L
is below the
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