參數(shù)資料
型號(hào): MC80C52CXXX-12/883:D
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CDIP40
封裝: 0.600 INCH, SIDE BRAZED, DIP-40
文件頁(yè)數(shù): 13/224頁(yè)
文件大?。?/td> 24907K
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11
XMEGA D3 [DATASHEET]
Atmel-8134N-ATxmega32D3-64D3-128D3-192D3-256D3-384D3_datasheet–03/2014
after reset, and the initial value is the highest address of the internal SRAM. If the SP is changed, it must be set to point
above address 0x2000, and it must be defined before any subroutine calls are executed or before interrupts are enabled.
During interrupts or subroutine calls, the return address is automatically pushed on the stack. The return address can be
two or three bytes, depending on program memory size of the device. For devices with 128KB or less of program
memory, the return address is two bytes, and hence the stack pointer is decremented/incremented by two. For devices
with more than 128KB of program memory, the return address is three bytes, and hence the SP is
decremented/incremented by three. The return address is popped off the stack when returning from interrupts using the
RETI instruction, and from subroutine calls using the RET instruction.
The SP is decremented by one when data are pushed on the stack with the PUSH instruction, and incremented by one
when data is popped off the stack using the POP instruction.
To prevent corruption when updating the stack pointer from software, a write to SPL will automatically disable interrupts
for up to four instructions or until the next I/O memory write.
After reset the stack pointer is initialized to the highest address of the SRAM. See Figure 7-2 on page 15.
6.8
Register file
The register file consists of 32 * 8-bit general purpose working registers with single clock cycle access time. The register
file supports the following input/output schemes:
One 8-bit output operand and one 8-bit result input
Two 8-bit output operands and one 8-bit result input
Two 8-bit output operands and one 16-bit result input
One 16-bit output operand and one 16-bit result input
Six of the 32 registers can be used as three 16-bit address register pointers for data space addressing, enabling efficient
address calculations. One of these address pointers can also be used as an address pointer for lookup tables in flash
program memory.
相關(guān)PDF資料
PDF描述
MC80C52EXXX-20SHXXX:D 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40
MC80C52EXXX-36SHXXX:D 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CDIP40
MD80C52EXXX-16SHXXX:D 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40
MR80C32-30:RD 8-BIT, 30 MHz, MICROCONTROLLER, CQCC44
MR80C32-30SHXXX:RD 8-BIT, 30 MHz, MICROCONTROLLER, CQCC44
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