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參數(shù)資料
| 型號： | P12C508 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8-Pin, 8-Bit CMOS Microcontroller |
| 中文描述： | 8引腳，8位CMOS微控制器 |
| 文件頁數(shù)： | 11/84頁 |
| 文件大小： | 526K |
| 代理商： | P12C508 |
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1996 Microchip Technology Inc.
Advance Information
DS40139A-page 11
PIC12C5XX
4.0
MEMORY ORGANIZATION
PIC12C5XX memory is organized into program mem-
ory 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 STA-
TUS register bit. For the PIC12C509 with a data mem-
ory register file 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
The PIC12C508 and PIC12C509 each have a 12-bit
Program Counter (PC) capable of addressing a 2K x
12 program memory space.
Only the first 512 x 12 (0000h-01FFh) for the
PIC12C508 and 1K x 12 (0000h-03FFh) for the
PIC12C509 are physically implemented. Refer to
Figure 4-1. Accessing a location above these
boundaries will cause a wrap-around within the first
512 x 12 space (PIC12C508) or 1K x 12 space
(PIC12C509). The reset vector is at 0000h. Location
01FFh (PIC12C508) or location 03FFh (PIC12C509)
contains the internal clock oscillator calibration value.
This value should never be overwritten.
FIGURE 4-1:
PROGRAM MEMORY MAP
AND STACK FOR THE
PIC12C5XX
CALL, RETLW
PC<11:0>
Stack Level 1
Stack Level 2
U
S
12
0000h
7FFh
01FFh
0200h
On-chip Program
Memory
Reset Vector (note 1)
Note 1: Address 0000h becomes the effec-
tive reset vector. Location 01FFh
(PIC12C508) or location 03FFh
(PIC12C509) contains the MOVLW
XX clock calibration value.
512 Word (PIC12C508)
1024 Word (PIC12C509)
03FFh
0400h
On-chip Program
Memory
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