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| 型號： | AT32AP7002-CTUR |
| 廠商： | Atmel |
| 文件頁數(shù)： | 29/83頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU AVR32 196-CBGA |
| 產(chǎn)品培訓(xùn)模塊： | MCU Product Line Introduction |
| 標準包裝： | 1 |
| 系列： | AVR®32 AP7 |
| 核心處理器： | AVR |
| 芯體尺寸： | 32-位 |
| 速度： | 150MHz |
| 連通性： | EBI/EMI，I²C，MMC，PS2，SPI，SSC，UART/USART，USB |
| 外圍設(shè)備： | AC'97，DMA，I²S，LCD，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 85 |
| 程序存儲器類型： | ROMless |
| RAM 容量： | 32K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 1.65 V ~ 1.95 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | D/A 2x16b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 196-TFBGA，CSBGA |
| 包裝： | 標準包裝 |
| 其它名稱： | AT32AP7002-CTURDKR |
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2011 Microchip Technology Inc.
DS70118J-page 27
dsPIC30F2010
All byte loads into any W register are loaded into the
LSB. The MSB is not modified.
A sign-extend (SE) instruction is provided to allow
users to translate 8-bit signed data to 16-bit signed
values. Alternatively, for 16-bit unsigned data, users
can clear the MSB of any W register by executing a
zero-extend
(ZE)
instruction
on
the
appropriate
address.
Although most instructions are capable of operating on
word or byte data sizes, it should be noted that some
instructions, including the DSP instructions, operate
only on words.
3.2.5
NEAR DATA SPACE
An 8 Kbyte ‘near’ data space is reserved in X address
memory space between 0x0000 and 0x1FFF, which is
directly addressable via a 13-bit absolute address field
within all memory direct instructions. The remaining X
address space and all of the Y address space is
addressable indirectly. Additionally, the whole of X data
space is addressable using MOV instructions, which
support memory direct addressing with a 16-bit
address field.
3.2.6
SOFTWARE STACK
The dsPIC DSC device contains a software stack. W15
is used as the Stack Pointer.
The Stack Pointer always points to the first available
free word, and grows from lower addresses towards
higher addresses. It pre-decrements for stack pops,
and post-increments for stack pushes, as shown in
Figure 3-9. Note that for a PC push during any CALL
instruction, the MSB of the PC is zero-extended before
the push, ensuring that the MSB is always clear.
There is a Stack Pointer Limit register (SPLIM) associ-
ated with the Stack Pointer. SPLIM is uninitialized at
Reset. As is the case for the Stack Pointer, SPLIM<0>
is forced to ‘0’, because all stack operations must be
word-aligned. Whenever an EA is generated using
W15 as a source or destination pointer, the address
thus generated is compared with the value in SPLIM. If
the contents of the Stack Pointer (W15) and the SPLIM
register are equal and a push operation is performed, a
stack error trap will not occur. The stack error trap will
occur on a subsequent push operation. Thus, for exam-
ple, if it is desirable to cause a stack error trap when the
stack grows beyond address 0x2000 in RAM, initialize
the SPLIM with the value, 0x1FFE.
Similarly, a stack pointer underflow (stack error) trap is
generated when the Stack Pointer address is found to
be less than 0x0800, thus preventing the stack from
interfering with the Special Function Register (SFR)
space.
A write to the SPLIM register should not be immediately
followed by an indirect read operation using W15.
FIGURE 3-9:
CALL
STACK FRAME
Note:
A PC push during exception processing
will concatenate the SRL register to the
MSB of the PC prior to the push.
<Free Word>
PC<15:0>
000000000
0
15
W15 (before CALL)
W15 (after CALL)
S
tac
k
Gr
ows
T
o
wa
rd
s
Hi
gh
er
Add
re
s
PUSH
: [W15++]
POP
: [--W15]
0x0000
PC<22:16>
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