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PIC12F508/509/16F505
DS41236E-page 18
2009 Microchip Technology Inc.
4.2
Program Memory Organization
For The PIC16F505
The PIC16F505 device has a 11-bit Program Counter
(PC) capable of addressing a 2K x 12 program memory
space.
The 1K x 12 (0000h-03FFh) for the PIC16F505 are
physically
implemented.
Refer
to
Figure 4-2.
Accessing a location above this boundary will cause a
wrap-around within the first 1K x 12 space. The
effective Reset vector is at 0000h (see Figure 4-2).
Location
03FFh
contains
the
internal
oscillator
calibration
value.
This
value
should
never
be
overwritten.
FIGURE 4-2:
PROGRAM MEMORY MAP
AND STACK FOR THE
PIC16F505
4.3
Data Memory Organization
Data memory is composed of registers or bytes of
RAM. Therefore, data memory for a device is specified
by its register file. The register file is divided into two
functional groups: Special Function Registers (SFR)
and General Purpose Registers (GPR).
The Special Function Registers include the TMR0
register, the Program Counter (PCL), the STATUS
register, the I/O registers (ports) and the File Select
Register (FSR). In addition, Special Function Registers
are used to control the I/O port configuration and
prescaler options.
The General Purpose Registers are used for data and
control information under command of the instructions.
For the PIC12F508/509, the register file is composed of
7 Special Function Registers, 9 General Purpose
Registers and 16 or 32 General Purpose Registers
accessed by banking (see Figure 4-3 and Figure 4-4).
For the PIC16F505, the register file is composed of 8
Special Function Registers, 8 General Purpose
Registers and 64 General Purpose Registers accessed
by banking (Figure 4-5).
4.3.1
GENERAL PURPOSE REGISTER
FILE
The General Purpose Register file is accessed, either
directly or indirectly, through the File Select Register
(FSR). See Section 4.9 “Indirect Data Addressing:
INDF and FSR Registers”.
CALL, RETLW
PC<11:0>
Stack Level 1
Stack Level 2
U
s
e
rMe
m
o
ry
Sp
a
c
e
12
0000h
7FFh
01FFh
0200h
Reset Vector(1)
Note
1:
Address 0000h becomes the
effective Reset vector. Location
03FFh contains the MOVLW XX
internal oscillator calibration value.
1024 Words
03FFh
0400h
On-chip Program
Memory
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