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ATTINY45 Datasheet(PDF) 10 Page - ATMEL Corporation |
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ATTINY45 Datasheet(HTML) 10 Page - ATMEL Corporation |
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10 / 222 page  10 2586J–AVR–12/06 ATtiny25/45/85 Figure 5-3. The X-, Y-, and Z-registers In the different addressing modes these address registers have functions as fixed displacement, automatic increment, and automatic decrement (see the instruction set reference for details). 5.6 Stack Pointer The Stack is mainly used for storing temporary data, for storing local variables and for storing return addresses after interrupts and subroutine calls. The Stack Pointer Register always points to the top of the Stack. Note that the Stack is implemented as growing from higher memory loca- tions to lower memory locations. This implies that a Stack PUSH command decreases the Stack Pointer. The Stack Pointer points to the data SRAM Stack area where the Subroutine and Interrupt 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 0x60. 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 or 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. The AVR Stack Pointer is implemented as two 8-bit registers in the I/O space. The number of bits actually used is implementation dependent. Note that the data space in some implementa- tions of the AVR architecture is so small that only SPL is needed. In this case, the SPH Register will not be present. 5.6.1 SPH and SPL – Stack Pointer Register 15 XH XL 0 X-register 70 7 0 R27 (0x1B) R26 (0x1A) 15 YH YL 0 Y-register 70 7 0 R29 (0x1D) R28 (0x1C) 15 ZH ZL 0 Z-register 7 070 R31 (0x1F) R30 (0x1E) Bit 1514131211109 8 0x3E SP15 SP14 SP13 SP12 SP11 SP10 SP9 SP8 SPH 0x3D SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 SPL 76543210 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Initial Value RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND |
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