PIC12F509-I/P Microchip Technology Inc., PIC12F509-I/P Datasheet - Page 18

• Manufacturer Part Number: PIC12F509-I/P
• Description: 8 PIN, 1.5 KB FLASH, 41 RAM, 6 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC12F509-I/P

• Cpu Speed: 1 MIPS
• Eeprom Memory: 0 Bytes
• Frequency: 4 MHz
• Input Output: 6
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 8-pin PDIP
• Programmable Memory: 1.5K Bytes
• Ram Size: 41 Bytes
• Speed: 4 MHz
• Timers: 1-8-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC12F508/509/16F505
4.2
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. Access-
ing 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:
DS41236B-page 16
Note 1:
CALL, RETLW
Program Memory Organization
For The PIC16F505
Address 0000h becomes the
effective Reset vector. Location
03FFh contains the MOVLW XX
internal oscillator calibration value.
On-chip Program
Reset Vector
Stack Level 1
Stack Level 2
PROGRAM MEMORY MAP
AND STACK FOR THE
PIC16F505
PC<11:0>
Memory
1024 Words
(1)
12
7FFh
0000h
01FFh
0200h
03FFh
0400h
Preliminary
4.3
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 reg-
ister, 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
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”.
Data Memory Organization
GENERAL PURPOSE REGISTER
FILE
© 2005 Microchip Technology Inc.