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參數(shù)資料
| 型號(hào)： | PIC12F505 |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8/14-Pin, 8-Bit Flash Microcontrollers |
| 中文描述： | 8/14-Pin，8位閃存微控制器 |
| 文件頁數(shù)： | 17/100頁 |
| 文件大?。?/td> | 741K |
| 代理商： | PIC12F505 |
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2007 Microchip Technology Inc.
Preliminary
DS41236C-page 15
PIC12F508/509/16F505
4.0
MEMORY ORGANIZATION
The PIC12F508/509/16F505 memories are organized
into program memory and data memory. For devices
with more than 512 bytes of program memory, a paging
scheme is used. Program memory pages are accessed
using one Status register bit. For the PIC12F509 and
PIC16F505, with data memory register files of more
than 32 registers, a banking scheme is used. Data
memory banks are accessed using the File Select
Register (FSR).
4.1
Program Memory Organization for
the PIC12F508/509
The PIC12F508 device has a 10-bit Program Counter
(PC) and PIC12F509 has a 11-bit Program Counter
(PC) capable of addressing a 2K x 12 program memory
space.
Only the first 512 x 12 (0000h-01FFh) for the
PIC12F508, and 1K x 12 (0000h-03FFh) for the
PIC12F509
are
physically
Figure 4-1). Accessing a location above these
boundaries will cause a wraparound within the first
512 x 12 space (PIC12F508) or 1K x 12 space
(PIC12F509). The effective Reset vector is a 0000h
(see Figure 4-1). Location 01FFh (PIC12F508) and
location 03FFh (PIC12F509) contain the internal
clock oscillator calibration value. This value should
never be overwritten.
implemented
(see
FIGURE 4-1:
PROGRAM MEMORY MAP
AND STACK FOR THE
PIC12F508/509
CALL, RETLW
PC<11:0>
Stack Level 1
Stack Level 2
U
S
12
0000h
7FFh
01FFh
0200h
On-chip Program
Memory
Reset Vector
(1)
Note
1:
Address 0000h becomes the
effective Reset vector. Location
01FFh, 03FFh (PIC12F508,
PIC12F509) contains the
MOVLW XX
internal oscillator calibration value.
512 Word
1024 Word
03FFh
0400h
On-chip Program
Memory
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