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PIC18F4580-I/PT 参数 Datasheet PDF下载

PIC18F4580-I/PT图片预览
型号: PIC18F4580-I/PT
PDF下载: 下载PDF文件 查看货源
内容描述: 28 /40/ 44引脚增强型闪存微控制器与ECAN技术, 10位A / D和纳瓦技术 [28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology]
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: 490 页 / 8912 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC18F2480/2580/4480/4580  
6.1  
Program Memory Organization  
6.0  
MEMORY ORGANIZATION  
PIC18 microcontrollers implement a 21-bit program  
counter, which is capable of addressing a 2-Mbyte  
program memory space. Accessing a location between  
upper boundary of the physically implemented memory  
and the 2-Mbyte address will return all ‘0’s (a NOP  
instruction).  
There are three types of memory in PIC18 Enhanced  
microcontroller devices:  
• Program Memory  
• Data RAM  
• Data EEPROM  
As Harvard architecture devices, the data and program  
memories use separate busses; this allows for con-  
current access of the two memory spaces. The data  
EEPROM, for practical purposes, can be regarded as  
a peripheral device, since it is addressed and accessed  
through a set of control registers.  
The PIC18F2480 and PIC18F4480 each have  
16 Kbytes of Flash memory and can store up to  
8,192 single-word instructions. The PIC18F2580 and  
PIC18F4580 each have 32 Kbytes of Flash memory  
and can store up to 16,384 single-word instructions.  
PIC18 devices have two interrupt vectors. The Reset  
vector address is at 0000h and the interrupt vector  
addresses are at 0008h and 0018h.  
Additional detailed information on the operation of the  
Flash program memory is provided in Section 7.0  
“Flash Program Memory”. Data EEPROM is dis-  
cussed separately in Section 8.0 “Data EEPROM  
Memory”.  
The program memory maps for PIC18FX480 and  
PIC18FX580 devices are shown in Figure 6-1.  
FIGURE 6-1:  
PROGRAM MEMORY MAP AND STACK FOR  
PIC18F2480/2580/4480/4580 DEVICES  
PIC18FX480  
PIC18FX580  
PC<20:0>  
PC<20:0>  
21  
21  
CALL,RCALL,RETURN  
RETFIE,RETLW  
CALL,RCALL,RETURN  
RETFIE,RETLW  
Stack Level 1  
Stack Level 1  
Stack Level 31  
Reset Vector  
Stack Level 31  
Reset Vector  
0000h  
0008h  
0000h  
High-Priority Interrupt Vector  
High-Priority Interrupt Vector  
Low-Priority Interrupt Vector  
0008h  
0018h  
Low-Priority Interrupt Vector 0018h  
On-Chip  
Program Memory  
3FFFh  
4000h  
On-Chip  
Program Memory  
7FFFh  
80000h  
Read ‘0’  
Read ‘0’  
1FFFFFh  
200000h  
1FFFFFh  
200000h  
© 2009 Microchip Technology Inc.  
DS39637D-page 67  
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