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參數(shù)資料
| 型號： | MQ80C52TXXX-20:D |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQFP44 |
| 封裝： | CERAMIC, QFP-44 |
| 文件頁數(shù)： | 5/81頁 |
| 文件大小： | 663K |
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13
ATtiny28L/V
1062F–AVR–07/06
Constant byte address is specified by the Z-register contents. The 15 MSBs select word
address (0 - 1K), and LSB selects low byte if cleared (LSB = 0) or high byte if set (LSB =
1).
Memory Access and
Instruction Execution
Timing
This section describes the general access timing concepts for instruction execution and
internal memory access.
The AVR CPU is driven by the System Clock, directly generated from the external clock
crystal for the chip. No internal clock division is used.
Figure 14 shows the parallel instruction fetches and instruction executions enabled by
the Harvard architecture and the fast-access register file concept. This is the basic pipe-
lining concept to obtain up to 1 MIPS per MHz with the corresponding unique results for
functions per cost, functions per clocks and functions per power unit.
Figure 14. The Parallel Instruction Fetches and Instruction Executions
Figure 15 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 15. Single Cycle ALU Operation
Flash Program Memory
The ATtiny28 contains 2K bytes of on-chip Flash memory for program storage. Since all
instructions are single 16-bit words, the Flash is organized as 1K x 16 words. The Flash
memory has an endurance of at least 1,000 write/erase cycles.
The ATtiny28 program counter is 10 bits wide, thus addressing the 1K word Flash pro-
gram memory. See “Programming the Flash” on page 47 for a detailed description of
Flash data downloading.
System Clock
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
System Clock
Total Execution Time
Register Operands Fetch
ALU Operation Execute
Result Write Back
T1
T2
T3
T4
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