参数资料
型号: PIC24FJ48GA002-I/SP
厂商: Microchip Technology
文件页数: 16/52页
文件大小: 0K
描述: IC PIC MCU FLASH 48K 28-DIP
产品培训模块: Graphics LCD System and PIC24 Interface
Asynchronous Stimulus
特色产品: PIC24FJ/33FJ MCUs & dsPIC? DSCs
标准包装: 15
系列: PIC® 24F
核心处理器: PIC
芯体尺寸: 16-位
速度: 32MHz
连通性: I²C,PMP,SPI,UART/USART
外围设备: 欠压检测/复位,LVD,POR,PWM,WDT
输入/输出数: 21
程序存储器容量: 48KB(16K x 24)
程序存储器类型: 闪存
RAM 容量: 8K x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 3.6 V
数据转换器: A/D 10x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-DIP(0.300",7.62mm)
包装: 管件
产品目录页面: 647 (CN2011-ZH PDF)
配用: DM240011-ND - KIT STARTER MPLAB FOR PIC24F MCU
AC162088-ND - HEADER MPLAB ICD2 24FJ64GA004 28
AC164337-ND - MODULE SOCKET FOR PM3 40DIP
DV164033-ND - KIT START EXPLORER 16 MPLAB ICD2
2008 Microchip Technology Inc.
DS39768D-page 23
PIC24FJXXXGA0XX
3.8
Reading Code Memory
Reading from code memory is performed by executing
a series of TBLRD instructions and clocking out the data
using the REGOUT command.
Table 3-8 shows the ICSP programming details for
reading code memory. In Step 1, the Reset vector is
exited. In Step 2, the 24-bit starting source address for
reading is loaded into the TBLPAG register and W6
register. The upper byte of the starting source address
is stored in TBLPAG and the lower 16 bits of the source
address are stored in W6.
To minimize the reading time, the packed instruction
word format that was utilized for writing is also used for
reading (see Figure 3-6). In Step 3, the Write Pointer,
W7, is initialized. In Step 4, two instruction words are
read from code memory and clocked out of the device,
through
the
VISI
register,
using
the
REGOUT
command. Step 4 is repeated until the desired amount
of code memory is read.
TABLE 3-8:
SERIAL INSTRUCTION EXECUTION FOR READING CODE MEMORY
Command
(Binary)
Data
(Hex)
Description
Step 1: Exit Reset vector.
0000
000000
040200
000000
NOP
GOTO
0x200
NOP
Step 2: Initialize TBLPAG and the Read Pointer (W6) for TBLRD instruction.
0000
200xx0
880190
2xxxx6
MOV
#<SourceAddress23:16>, W0
MOV
W0, TBLPAG
MOV
#<SourceAddress15:0>, W6
Step 3: Initialize the Write Pointer (W7) to point to the VISI register.
0000
207847
000000
MOV
#VISI, W7
NOP
Step 4: Read and clock out the contents of the next two locations of code memory, through the VISI register, using
the REGOUT command.
0000
0001
0000
0001
0000
0001
0000
BA0B96
000000
<VISI>
000000
BADBB6
000000
BAD3D6
000000
<VISI>
000000
BA0BB6
000000
<VISI>
000000
TBLRDL
[W6], [W7]
NOP
Clock out contents of VISI register
NOP
TBLRDH.B [W6++], [W7++]
NOP
TBLRDH.B [++W6], [W7--]
NOP
Clock out contents of VISI register
NOP
TBLRDL
[W6++], [W7]
NOP
Clock out contents of VISI register
NOP
Step 5: Reset device internal PC.
0000
040200
000000
GOTO
0x200
NOP
Step 6: Repeat Steps 4 and 5 until all desired code memory is read.
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