ATA6616-P3QW Atmel, ATA6616-P3QW Datasheet - Page 35
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ATA6616-P3QW
Manufacturer Part Number
ATA6616-P3QW
Description
TXRX MULTICHIP MOD LIN SIP 38QFN
Manufacturer
Atmel
Series
AVR® ATA66 LIN-SBCr
Datasheet
1.ATA6617-EK.pdf
(308 pages)
Specifications of ATA6616-P3QW
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, LIN, SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
16
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
38-VQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATA6616-P3QW
Manufacturer:
ATMEL
Quantity:
950
Part Number:
ATA6616-P3QW
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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4.3.4.1
4.3.5
9132D–AUTO–12/10
Stack Pointer
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 indi-
rect address registers X, Y, and Z are defined as described in
Figure 4-4.
In the different addressing modes these address registers have functions as fixed displace-
ment, automatic increment, and automatic decrement (see the instruction set reference for
details).
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 locations 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
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
X-register
Y-register
Z-register
®
Stack Pointer is implemented as two 8-bit registers in the I/O space. The number of
The X-, Y-, and Z-registers
15
7
R27 (0x1B)
15
7
R29 (0x1D)
15
7
R31 (0x1F)
XH
YH
ZH
0
Atmel ATA6616/ATA6617
0
0
7
R26 (0x1A)
7
R28 (0x1C)
7
R30 (0x1E)
Figure 4-4 on page
XL
YL
ZL
35.
35
0
0
0
0
0
0
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