參數(shù)資料
型號(hào)： PCA9698DGG/S911,51
廠商： NXP Semiconductors
文件頁數(shù)： 4/48頁
文件大?。?/td> 0K
描述： IC I/O EXPANDER I2C 40B 56TSSOP
標(biāo)準(zhǔn)包裝： 2,000
接口： I²C
輸入/輸出數(shù)： 40
中斷輸出： 是
頻率 - 時(shí)鐘： 1MHz
電源電壓： 2.3 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 56-TFSOP（0.240"，6.10mm 寬）
供應(yīng)商設(shè)備封裝： 56-TSSOP
包裝： 帶卷 (TR)
包括： POR
其它名稱： 935285491518
PCA9698DGG/S911-T
PCA9698DGG/S911-T-ND
12
7810C–AVR–10/12
Atmel ATmega328P [Preliminary]
6.4.1
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 6-3.
Figure 6-3.
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).
6.5
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 6-1 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. 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.
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)
Table 6-1.
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
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