參數(shù)資料
型號： 16LF628A
廠商： Microchip Technology Inc.
元件分類： 8位微控制器
英文描述： FLASH-Based 8-Bit CMOS Microcontrollers
中文描述： 基于閃存的8位CMOS微控制器
文件頁數(shù)： 17/168頁
文件大小： 3760K
代理商： 16LF628A
2002 Microchip Technology Inc.
Preliminary
DS40044A-page 15
PIC16F627A/628A/648A
4.0
MEMORY ORGANIZATION
4.1
Program Memory Organization
The PIC16F627A/628A/648A has a 13-bit program
counter capable of addressing an 8K x 14 program
memory space. Only the first 1K x 14 (0000h - 03FFh)
for the PIC16F627A, 2K x 14 (0000h - 07FFh) for the
PIC16F628A and 4K x 14 (0000h - 0FFFh) for the
PIC16F648A are physically implemented. Accessing a
location above these boundaries will cause a wrap-
around within the first 1K x 14 space (PIC16F627A), 2K
x 14 space (PIC16F628A) or 4K x 14 space
(PIC16F648A). The RESET vector is at 0000h and the
interrupt vector is at 0004h (Figure 4-1).
FIGURE 4-1:
PROGRAM MEMORY MAP
AND STACK
4.2
Data Memory Organization
The data memory (Figure 4-2 and Figure 4-3) is
partitioned into four banks, which contain the general
purpose registers and the Special Function Registers
(SFR). The SFR’s are located in the first 32 locations of
each Bank. There are general purpose registers imple-
mented as static RAM in each Bank. Table 4-1 lists the
general purpose register available in each of the four
banks.
TABLE 4-1:
GENERAL PURPOSE STATIC
RAM REGISTERS
Addresses F0h-FFh, 170h-17Fh and 1F0h-1FFh are
implemented as common RAM and mapped back to
addresses 70h-7Fh.
Table 4-2 lists how to access the four banks of registers
via the STATUS Register bits RP1 and RP0.
TABLE 4-2:
ACCESS TO BANKS OF
REGISTERS
4.2.1
GENERAL PURPOSE REGISTER
FILE
The register file is organized as 224 x 8 in the
PIC16F627A/628A and 256 x 8 in the PIC16F648A.
Each is accessed either directly or indirectly through
the File Select Register (FSR), See Section 4.4.
PC<12:0>
13
000h
0004
0005
03FFh
1FFFh
Stack Level 1
Stack Level 2
Stack Level 8
RESET Vector
Interrupt Vector
On-chip Program
Memory
CALL, RETURN
RETFIE, RETLW
07FFh
PIC16F627A,
PIC16F628A and
PIC16F648A
On-chip Program
Memory
PIC16F628A and
PIC16F648A
On-chip Program
Memory
PIC16F648A only
0FFFh
PIC16F627A/628A
PIC16F648A
Bank0
20-7Fh
20-7Fh
Bank1
A0h-FF
A0h-FF
Bank2
120h-14Fh, 170h-17Fh
120h-17Fh
Bank3
1F0h-1FFh
1F0h-1FFh
RP1
RP0
Bank0
0
0
Bank1
0
1
Bank2
1
0
Bank3
1
1
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