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| 型號(hào)： | MR80C52EXXX-20SCD |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44 |
| 文件頁(yè)數(shù)： | 200/219頁(yè) |
| 文件大?。?/td> | 7896K |
| 代理商： | MR80C52EXXX-20SCD |
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8
ATmega8A [DATASHEET]
8159E–AVR–02/2013
The ALU supports arithmetic and logic operations between registers or between a constant and a register. Single
register operations can also be executed in the ALU. After an arithmetic operation, the Status Register is updated
to reflect information about the result of the operation.
The Program flow is provided by conditional and unconditional jump and call instructions, able to directly address
the whole address space. Most AVR instructions have a single 16-bit word format. Every Program memory
address contains a 16- or 32-bit instruction.
Program Flash memory space is divided in two sections, the Boot program section and the Application program
section. Both sections have dedicated Lock Bits for write and read/write protection. The SPM instruction that writes
into the Application Flash memory section must reside in the Boot program section.
During interrupts and subroutine calls, the return address Program Counter (PC) is stored on the Stack. The Stack
is effectively allocated in the general data SRAM, and consequently the Stack size is only limited by the total
SRAM size and the usage of the SRAM. All user programs must initialize the SP in the reset routine (before sub-
routines or interrupts are executed). The Stack Pointer SP is read/write accessible in the I/O space. The data
SRAM can easily be accessed through the five different addressing modes supported in the AVR architecture.
The memory spaces in the AVR architecture are all linear and regular memory maps.
A flexible interrupt module has its control registers in the I/O space with an additional global interrupt enable bit in
the Status Register. All interrupts have a separate Interrupt Vector in the Interrupt Vector table. The interrupts have
priority in accordance with their Interrupt Vector position. The lower the Interrupt Vector address, the higher the
priority.
The I/O memory space contains 64 addresses for CPU peripheral functions as Control Registers, SPI, and other
I/O functions. The I/O Memory can be accessed directly, or as the Data Space locations following those of the Reg-
ister File, 0x20 - 0x5F.
7.2
Arithmetic Logic Unit – ALU
The high-performance Atmel
AVR ALU operates in direct connection with all the 32 general purpose working reg-
isters. Within a single clock cycle, arithmetic operations between general purpose registers or between a register
and an immediate are executed. The ALU operations are divided into three main categories – arithmetic, logical,
and bit-functions. Some implementations of the architecture also provide a powerful multiplier supporting both
signed/unsigned multiplication and fractional format. See the “Instruction Set” section for a detailed description.
7.3
Status Register
The Status Register contains information about the result of the most recently executed arithmetic instruction. This
information can be used for altering program flow in order to perform conditional operations. Note that the Status
Register is updated after all ALU operations, as specified in the Instruction Set Reference. This will in many cases
remove the need for using the dedicated compare instructions, resulting in faster and more compact code.
The Status Register is not automatically stored when entering an interrupt routine and restored when returning
from an interrupt. This must be handled by software.
7.3.1
SREG – The AVR Status Register
Bit
7
6
543210
I
T
H
S
V
N
Z
C
SREG
Read/Write
R/W
Initial Value
0
000000
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MR80C32-16SHXXX | 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44 |
| MD80C32EXXX-30/883 | 8-BIT, 30 MHz, MICROCONTROLLER, CDIP40 |
| MR80C32E-16SC | 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44 |
| MQ80C52EXXX-20/883D | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQFP44 |
| MR80C32E-16SHXXX:R | 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| MR80C86 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor |
| MR80C86/B | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述:Microprocessor, 16 Bit, 44 Pin, Ceramic, LCC |
| MR80C86-2 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor |
| MR80C86-2/883 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MR80C86-2/B | 制造商:Intersil Corporation 功能描述:MPU 80C86 16BIT CMOS 8MHZ 44PLCC - Rail/Tube |
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