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參數(shù)資料
| 型號： | MR80C154-25/883D |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 25 MHz, MICROCONTROLLER, CQCC44 |
| 文件頁數(shù)： | 57/214頁 |
| 文件大?。?/td> | 61013K |
| 代理商： | MR80C154-25/883D |
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15
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
Figure 7-4.
The parallel instruction fetches and instruction executions.
Figure 7-5 shows the internal timing concept for the Register File. In a single clock cycle an ALU operation using
two register operands is executed, and the result is stored back to the destination register.
Figure 7-5.
Single cycle ALU operation.
7.8
Reset and interrupt handling
The AVR provides several different interrupt sources. These interrupts and the separate Reset Vector each have a
separate program vector in the program memory space. All interrupts are assigned individual enable bits which
must be written logic one together with the Global Interrupt Enable bit in the Status Register in order to enable the
interrupt. Depending on the Program Counter value, interrupts may be automatically disabled when Boot Lock bits
BLB02 or BLB12 are programmed. This feature improves software security. See the section ”Memory program-
ming” on page 257 for details.
The lowest addresses in the program memory space are by default defined as the Reset and Interrupt Vectors.
The complete list of vectors is shown in ”Interrupts” on page 51. The list also determines the priority levels of the
different interrupts. The lower the address the higher is the priority level. RESET has the highest priority, and next
is INT0 – the External Interrupt Request 0. The Interrupt Vectors can be moved to the start of the Boot Flash sec-
tion by setting the IVSEL bit in the MCU Control Register (MCUCR). Refer to ”Interrupts” on page 51 for more
information. The Reset Vector can also be moved to the start of the Boot Flash section by programming the
BOOTRST Fuse, see ”Boot Loader Support – Read-While-Write Self-Programming” on page 241.
When an interrupt occurs, the Global Interrupt Enable I-bit is cleared and all interrupts are disabled. The user soft-
ware can write logic one to the I-bit to enable nested interrupts. All enabled interrupts can then interrupt the current
interrupt routine. The I-bit is automatically set when a Return from Interrupt instruction – RETI – is executed.
There are basically two types of interrupts. The first type is triggered by an event that sets the Interrupt Flag. For
these interrupts, the Program Counter is vectored to the actual Interrupt Vector in order to execute the interrupt
handling routine, and hardware clears the corresponding Interrupt Flag. Interrupt Flags can also be cleared by writ-
ing a logic one to the flag bit position(s) to be cleared. If an interrupt condition occurs while the corresponding
interrupt enable bit is cleared, the Interrupt Flag will be set and remembered until the interrupt is enabled, or the
flag is cleared by software. Similarly, if one or more interrupt conditions occur while the Global Interrupt Enable bit
clk
1st Instruction Fetch
1st Instruction Execute
2nd Instruction Fetch
2nd Instruction Execute
3rd Instruction Fetch
3rd Instruction Execute
4th Instruction Fetch
T1
T2
T3
T4
CPU
Total Execution Time
Register Operands Fetch
ALU Operation Execute
Result Write Back
T1
T2
T3
T4
clk
CPU
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MQ83C154XXX-30P883D | 8-BIT, MROM, 30 MHz, MICROCONTROLLER, CQFP44 |
| MD83C154CXXX-L16/883D | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
| MQ80C154-16/883 | 8-BIT, 16 MHz, MICROCONTROLLER, CQFP44 |
| MR83C154CXXX-25P883 | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44 |
| MQ83C154CXXX-36/883D | 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MR80C154-30 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller |
| MR80C154-36 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller |
| MR80C154-L16 | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller |
| MR80C31BH | 制造商:ROCHESTER 制造商全稱:ROCHESTER 功能描述:CMOS SINGLE - CHIP 8-BIT MICROCOMPUTER 64K program Memory Space |
| MR80C31BH/B | 制造商:n/a 功能描述:8506401XA |
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