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AT90S8535 Datasheet(PDF) 20 Page - ATMEL Corporation |
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AT90S8535 Datasheet(HTML) 20 Page - ATMEL Corporation |
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20 / 127 page  20 AT90S/LS8535 1041H–11/01 Stack Pointer – SP The AT90S8535 Stack Pointer is implemented as two 8-bit registers in the I/O space locations $3E ($5E) and $3D ($5D). As the AT90S8535 data memory has $25F loca- tions, 10 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 1 when data is pushed onto the stack with the PUSH instruction and it is decremented by 2 when an address is pushed onto the stack with subroutine calls and interrupts. The Stack Pointer is incremented by 1 when data is popped from the stack with the POP instruction and it is incremented by 2 when an address is popped from the stack with return from subroutine RET or return from interrupt RETI. Reset and Interrupt Handling The AT90S8535 provides 16 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. Bit 1514 1312 1110 9 8 $3E ($5E) –– –––– SP9 SP8 SPH $3D ($5D) SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 SPL 76 543210 Read/Write R RRRRR R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 000000 00 000000 Table 2. Reset and Interrupt Vectors Vector No. Program Address Source Interrupt Definition 1 $000 RESET Hardware Pin, Power-on Reset and Watchdog Reset 2 $001 INT0 External Interrupt Request 0 3 $002 INT1 External Interrupt Request 1 4 $003 TIMER2 COMP Timer/Counter2 Compare Match 5 $004 TIMER2 OVF Timer/Counter2 Overflow 6 $005 TIMER1 CAPT Timer/Counter1 Capture Event 7 $006 TIMER1 COMPA Timer/Counter1 Compare Match A 8 $007 TIMER1 COMPB Timer/Counter1 Compare Match B 9 $008 TIMER1 OVF Timer/Counter1 Overflow 10 $009 TIMER0 OVF Timer/Counter0 Overflow 11 $00A SPI, STC SPI Serial Transfer Complete 12 $00B UART, RX UART, Rx Complete |
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