參數(shù)資料
型號: R5F6418JADFE
元件分類: 微控制器/微處理器
英文描述: MICROCONTROLLER, PQFP176
封裝: 24 X 24 MM, 0.50 MM PITCH, PLASTIC, LQFP-176
文件頁數(shù): 33/128頁
文件大小: 922K
代理商: R5F6418JADFE
13
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
7.5.1
SPH and SPL – Stack Pointer High and Stack Pointer Low Register
7.6
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 7-4 shows the parallel instruction fetches and instruction executions enabled by the Harvard architecture and the fast-
access register file concept. This is the basic pipelining concept to obtain up to 1MIPS per MHz with the corresponding
unique results for functions per cost, functions per clocks, and functions per power-unit.
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
Bit
1514
1312
11
10
9
8
SP15
SP14
SP13
SP12
SP11
SP10
SP9
SP8
SPH
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP0
SPL
76
54
321
0
Read/Write
R/W
Initial Value
RAMEND
clk
CPU
1st Instruction Fetch
1st Instruction Execute
2nd Instruction Fetch
T1
T2
T3
T4
2nd Instruction Execute
3rd Instruction Fetch
3rd Instruction Execute
4th Instruction Fetch
clk
CPU
1st Instruction Fetch
1st Instruction Execute
2nd Instruction Fetch
T1
T2
T3
T4
2nd Instruction Execute
3rd Instruction Fetch
3rd Instruction Execute
4th Instruction Fetch
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