 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ATMEGA32A Datasheet(PDF) 11 Page - ATMEL Corporation |
|
||||||||||||||||||||||||||||||
ATMEGA32A Datasheet(HTML) 11 Page - ATMEL Corporation |
|
|
11 / 336 page  11 ATmega32A [DATASHEET] Atmel-8155D-AVR-ATmega32A-Datasheet_02/2014 7.4.1 The X-register, Y-register and Z-register The registers R26:R31 have some added functions to their general purpose usage. These registers are 16-bit address pointers for indirect addressing of the Data Space. The three indirect address registers X, Y, and Z are defined as described in Figure 7-3. Figure 7-3. The X-, Y-, and Z-registers In the different addressing modes these address registers have functions as fixed displacement, automatic incre- ment, and automatic decrement (see the Instruction Set Reference for details). 7.5 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. Note that the Stack is implemented as growing from higher to lower memory locations. The Stack Pointer Register always points to the top of the Stack. The Stack Pointer points to the data SRAM Stack area where the Subroutine and Interrupt Stacks are located. A Stack PUSH command will decrease the Stack Pointer. The Stack in the data SRAM must be defined by the program before any subroutine calls are executed or interrupts are enabled. Initial Stack Pointer value equals the last address of the internal SRAM and the Stack Pointer must be set to point above start of the SRAM, see Figure 8-2 on page 16. See Table 7-1 on page 11 for Stack Pointer details. 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 implementations of the AVR architecture is so small that only SPL is needed. In this case, the SPH Register will not be present. 15 XH XL 0 X - register 70 7 0 R27 ($1B) R26 ($1A) 15 YH YL 0 Y - register 70 7 0 R29 ($1D) R28 ($1C) 15 ZH ZL 0 Z - register 70 7 0 R31 ($1F) R30 ($1E) Table 7-1. Stack Pointer instructions Instruction Stack pointer Description PUSH Decremented by 1 Data is pushed onto the stack CALL ICALL RCALL Decremented by 2 Return address is pushed onto the stack with a subroutine call or interrupt POP Incremented by 1 Data is popped from the stack RET RETI Incremented by 2 Return address is popped from the stack with return from subroutine or return from interrupt |
Similar Part No. - ATMEGA32A_14 |
|
Similar Description - ATMEGA32A_14 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
