Datasheet 搜索 > 微控制器 > Microchip（微芯） > PIC16F84A-20I/SO 数据手册 > PIC16F84A-20I/SO 用户编程技术手册 2/16 页
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PIC16F84A-20I/SO 用户编程技术手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
SOIC-18
描述:
MICROCHIP PIC16F84A-20I/SO 微控制器, 8位, 闪存, PIC16F, 20 MHz, 1.75 KB, 68 Byte, 18 引脚, SOIC
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PIC16F84A-20I/SO数据手册
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PIC16F8X
DS30262E-page 2 2002 Microchip Technology Inc.
2.0 PROGRAM MODE ENTRY
2.1 User Program Memory Map
The user memory space extends from 0000h to 1FFFh
(8 Kbytes), of which 1 Kbyte (0000h - 03FFh) is physi-
cally implemented. In actual implementation, the
on-chip user program memory is accessed by the lower
10 bits of the PC, with the upper 3 bits of the PC
ignored. Therefore, if the PC is greater than 03FFh, it
will wrap around and address a location within the
physically implemented memory (see Figure 2-1).
In Programming mode, the program memory space
extends from 0000h to 3FFFh, with the first half
(0000h-1FFFh) being user program memory and the
second half (2000h-3FFFh) being configuration mem-
ory. The PC will increment from 0000h to 1FFFh and
wrap to 0000h, or 2000h to 3FFFh and wrap around to
2000h (not to 0000h). Once in configuration memory,
the highest bit of the PC stays a ‘1’, thus always point-
ing to the configuration memory. The only way to point
to user program memory is to reset the part and
re-enter Program/Verify mode, as described in
Section 2.3.
In the configuration memory space, 2000h-200Fh are
physically implemented. However, only locations
2000h through 2007h are available. Other locations are
reserved. Locations beyond 2000Fh will physically
access user memory (see Figure 2-1).
FIGURE 2-1: PROGRAM MEMORY MAPPING
0h
3FFh
400h
1FFFh
2000h
ID Location
ID Location
ID Location
ID Location
Reserved
Reserved
Reserved
Configuration Word
2000
2001
2002
2003
2004
2005
2006
2007
2008h
3FFFh
Not Implemented
Not Implemented
Implemented
Implemented
1FFh
Not Implemented
Not Implemented
Implemented
Implemented
0.5K Word
1K Word
200Fh
Reserved Reserved
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