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ATMEGA48PA-AU 参数 Datasheet PDF下载

ATMEGA48PA-AU图片预览
型号: ATMEGA48PA-AU
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器与4/8/ 16 / 32K字节的系统内可编程闪存 [8-bit Microcontroller with 4/8/16/32K Bytes In-System Programmable Flash]
分类和应用: 闪存微控制器和处理器外围集成电路时钟
文件页数/大小: 448 页 / 12817 K
品牌: ATMEL [ ATMEL ]
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ATmega48PA/88PA/168PA/328P  
6.5.1  
SPH and SPL – Stack Pointer High and Stack Pointer Low Register  
Bit  
15  
SP15  
SP7  
14  
SP14  
SP6  
13  
SP13  
SP5  
12  
SP12  
SP4  
11  
SP11  
SP3  
10  
SP10  
SP2  
9
SP9  
8
SP8  
0x3E (0x5E)  
0x3D (0x5D)  
SPH  
SPL  
SP1  
SP0  
7
6
5
4
3
2
1
0
Read/Write  
Initial Value  
R/W  
R/W  
R/W  
R/W  
R/W  
R/W  
R/W  
R/W  
R/W  
R/W  
R/W  
R/W  
R/W  
R/W  
R/W  
R/W  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
RAMEND  
6.6  
Instruction Execution Timing  
This section describes the general access timing concepts for instruction execution. The AVR  
CPU is driven by the CPU clock clkCPU, directly generated from the selected clock source for the  
chip. No internal clock division is used.  
Figure 6-4 shows the parallel instruction fetches and instruction executions enabled by the Har-  
vard architecture and the fast-access Register File concept. This is the basic pipelining 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 6-4. The Parallel Instruction Fetches and Instruction Executions  
T1  
T2  
T3  
T4  
clkCPU  
1st Instruction Fetch  
1st Instruction Execute  
2nd Instruction Fetch  
2nd Instruction Execute  
3rd Instruction Fetch  
3rd Instruction Execute  
4th Instruction Fetch  
Figure 6-5 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 destina-  
tion register.  
Figure 6-5. Single Cycle ALU Operation  
T1  
T2  
T3  
T4  
clkCPU  
Total Execution Time  
Register Operands Fetch  
ALU Operation Execute  
Result Write Back  
13  
8161D–AVR–10/09