参数资料
型号: PIC16F505-I/MG
厂商: Microchip Technology
文件页数: 8/44页
文件大小: 0K
描述: MCU PIC 1.5K FLASH 3X3 16QFN
产品培训模块: 8-bit PIC® Microcontroller Portfolio
标准包装: 120
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
外围设备: POR,WDT
输入/输出数: 11
程序存储器容量: 1.5KB(1K x 12)
程序存储器类型: 闪存
RAM 容量: 72 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 16-VFQFN 裸露焊盘
包装: 托盘
产品目录页面: 638 (CN2011-ZH PDF)
PIC12F508/509/16F505
DS41236E-page 16
2009 Microchip Technology Inc.
3.1
Clocking Scheme/Instruction
Cycle
The clock input (OSC1/CLKIN pin) is internally divided
by four to generate four non-overlapping quadrature
clocks, namely Q1, Q2, Q3 and Q4. Internally, the PC
is incremented every Q1 and the instruction is fetched
from program memory and latched into the instruction
register in Q4. It is decoded and executed during the
following Q1 through Q4. The clocks and instruction
execution flow is shown in Figure 3-3 and Example 3-1.
3.2
Instruction Flow/Pipelining
An instruction cycle consists of four Q cycles (Q1, Q2,
Q3 and Q4). The instruction fetch and execute are
pipelined such that fetch takes one instruction cycle,
while decode and execute take another instruction
cycle. However, due to the pipelining, each instruction
effectively executes in one cycle. If an instruction
causes the PC to change (e.g., GOTO), then two cycles
are required to complete the instruction (Example 3-1).
A fetch cycle begins with the PC incrementing in Q1.
In the execution cycle, the fetched instruction is latched
into the Instruction Register (IR) in cycle Q1. This
instruction is then decoded and executed during the
Q2, Q3 and Q4 cycles. Data memory is read during Q2
(operand read) and written during Q4 (destination
write).
FIGURE 3-3:
CLOCK/INSTRUCTION CYCLE
EXAMPLE 3-1:
INSTRUCTION PIPELINE FLOW
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
OSC1
Q1
Q2
Q3
Q4
PC
PC + 1
PC + 2
Fetch INST (PC)
Execute INST (PC – 1)
Fetch INST (PC + 1)
Execute INST (PC)
Fetch INST (PC + 2)
Execute INST (PC + 1)
Internal
phase
clock
All instructions are single cycle, except for any program branches. These take two cycles, since the fetch instruction
is “flushed” from the pipeline, while the new instruction is being fetched and then executed.
1. MOVLW 03H
Fetch 1
Execute 1
2. MOVWF PORTB
Fetch 2
Execute 2
3. CALL
SUB_1
Fetch 3
Execute 3
4. BSF
PORTB, BIT1
Fetch 4
Flush
Fetch SUB_1 Execute SUB_1
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