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ATMEGA163 Datasheet(PDF) 21 Page - ATMEL Corporation |
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ATMEGA163 Datasheet(HTML) 21 Page - ATMEL Corporation |
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21 / 187 page  21 ATmega163(L) 1142E–AVR–02/03 The Stack Pointer – SP The ATmega163 Stack Pointer is implemented as two 8-bit registers in the I/O space locations $3E ($5E) and $3D ($5D). As the ATmega163 data memory has $460 loca- tions, 11 bits are used. The Stack Pointer points to the data SRAM Stack area where the Subroutine and Inter- rupt Stacks are located. This Stack space in the data SRAM must be defined by the program before any subroutine calls are executed or interrupts are enabled. The Stack Pointer must be set to point above $60. The Stack Pointer is decremented by one when data is pushed onto the Stack with the PUSH instruction, and it is decremented by two when the return address is pushed onto the Stack with subroutine call and interrupt. The Stack Pointer is incremented by one when data is popped from the Stack with the POP instruction, and it is incremented by two when data is popped from the Stack with return from subroutine RET or return from interrupt RETI. Reset and Interrupt Handling The ATmega163 provides 17 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 which 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 3. The list also determines the priority levels of the different interrupts. The lower the address the higher is the priority level. RESET has the highest priority, and next is INT0 – the Exter- nal Interrupt Request 0, etc. Bit 15 1413 1211 10 9 8 $3E ($5E) – – – – – SP10 SP9 SP8 SPH $3D ($5D) SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 SPL 7 6 5 432 10 Read/Write R R R R R R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 00 000 00 0 0 0 000 00 Table 3. Reset and Interrupt Vectors Vector No. Program Address Source Interrupt Definition 1 $000 (1) RESET External Pin, Power-on Reset, Brown-out Reset and Watchdog Reset 2 $002 INT0 External Interrupt Request 0 3 $004 INT1 External Interrupt Request 1 4 $006 TIMER2 COMP Timer/Counter2 Compare Match 5 $008 TIMER2 OVF Timer/Counter2 Overflow 6 $00A TIMER1 CAPT Timer/Counter1 Capture Event 7 $00C TIMER1 COMPA Timer/Counter1 Compare Match A 8 $00E TIMER1 COMPB Timer/Counter1 Compare Match B 9 $010 TIMER1 OVF Timer/Counter1 Overflow 10 $012 TIMER0 OVF Timer/Counter0 Overflow 11 $014 SPI, STC Serial Transfer Complete 12 $016 UART, RXC UART, Rx Complete |
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