Rainbow Electronics Atmega169L - Manual (Page 46)

46
ATmega169V/L
2514A–AVR–08/02
Table 23 shows reset and Interrupt Vectors placement for the various combinations of
BOOTRST and IVSEL settings. If the program never enables an interrupt source, the
Interrupt Vectors are not used, and regular program code can be placed at these loca-
tions. This is also the case if the Reset Vector is in the Application section while the
Interrupt Vectors are in the Boot section or vice versa.
Note: 1. The Boot Reset Address is shown in Table 113 on page 263. For the BOOTRST
Fuse “1” means unprogrammed while “0” means programmed.
The most typical and general program setup for the Reset and Interrupt Vector
Addresses in ATmega169 is:
Address Labels Code Comments
0x0000 jmp RESET ; Reset Handler
0x0002 jmp EXT_INT0 ; IRQ0 Handler
0x0004 jmp PCINT0 ; PCINT0 Handler
0x0006 jmp PCINT1 ; PCINT0 Handler
0x0008 jmp TIM2_COMP ; Timer2 Compare Handler
0x000A jmp TIM2_OVF ; Timer2 Overflow Handler
0x000C jmp TIM1_CAPT ; Timer1 Capture Handler
0x000E jmp TIM1_COMPA ; Timer1 CompareA Handler
0x0010 jmp TIM1_COMPB ; Timer1 CompareB Handler
0x0012 jmp TIM1_OVF ; Timer1 Overflow Handler
0x0014 jmp TIM0_COMP ; Timer0 Compare Handler
0x0016 jmp TIM0_OVF ; Timer0 Overflow Handler
0x0018 jmp SPI_STC ; SPI Transfer Complete Handler
0x001A jmp USART0_RXC ; USART0 RX Complete Handler
0x001C jmp USART0_DRE ; USART0,UDR Empty Handler
0x001E jmp USART0_TXC ; USART0 TX Complete Handler
0x0020 jmp USI_STRT ; USI Start Condition Handler
0x0022 jmp USI_OVFL ; USI Overflow Handler
0x0024 jmp ADC ; ADC Conversion Complete Handler
0x0026 jmp ANA_COMP ; Analog Comparator Handler
0x0028 jmp EE_RDY ; EEPROM Ready Handler
0x002A jmp SPM_RDY ; SPM Ready Handler
0x002C jmp LCD_SOF ; LCD Start of Frame Handler
;
0x002E RESET: ldi r16, high(RAMEND); Main program start
0x002F out SPH,r16 Set Stack Pointer to top of RAM
0x0030 ldi r16, low(RAMEND)
0x0031 out SPL,r16
0x0032 sei ; Enable interrupts
0x0033 xxx
... ... ... ...
Table 23. Reset and Interrupt Vectors Placement (1)
BOOTRST IVSEL Reset Address Interrupt Vectors Start Address
1 0 0x0000 0x0002
1 1 0x0000 Boot Reset Address + 0x0002
0 0 Boot Reset Address 0x0002
0 1 Boot Reset Address Boot Reset Address + 0x0002