參數(shù)資料
型號： MR80C52CXXX-36/883:R
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQCC44
文件頁數(shù)： 46/142頁
文件大?。?/td> 25028K
14
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
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 reg-
isters 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 increment, 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
See Table 7-1 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, see Table 7-2 on page 15. 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 (0x1B)
R26 (0x1A)
15
YH
YL
0
Y-register
70
7
0
R29 (0x1D)
R28 (0x1C)
15
ZH
ZL
0
Z-register
70
7
0
R31 (0x1F)
R30 (0x1E)
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
相關(guān)PDF資料
PDF描述
MR80C52EXXX-16SHXXX:RD 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44
MQ80C32-12SHXXX:D 8-BIT, 12 MHz, MICROCONTROLLER, CQFP44
MQ80C32-20SHXXX:RD 8-BIT, 20 MHz, MICROCONTROLLER, CQFP44
MC80C52CXXX-36:D 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CDIP40
MC80C52XXX-36/883:D 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CDIP40
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