PIC16F631-I/P Microchip Technology Inc., PIC16F631-I/P Datasheet - Page 27

• Manufacturer Part Number: PIC16F631-I/P
• Description: MCU, 8-Bit, 1KW Flash, 64 RAM, 18 I/O, PDIP-20
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F631-I/P

• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 128 Bytes
• Input Output: 18
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 20-pin PDIP
• Programmable Memory: 1.75K Bytes
• Ram Size: 64 Bytes
• Speed: 20 MHz
• Timers: 1-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

2.0
2.1
The PIC16F631/677/685/687/689/690 has a 13-bit
program counter capable of addressing an 8K x 14
program memory space. Only the first 1K x 14
(0000h-03FFh) is physically implemented for the
PIC16F631, the first 2K x 14 (0000h-07FFh) for the
PIC16F677/PIC16F687,
(0000h-0FFFh) for the PIC16F685/PIC16F689/
PIC16F690. Accessing a location above these
boundaries will cause a wraparound. The Reset vector
is at 0000h and the interrupt vector is at 0004h (see
Figures 2-1 through 2-3).
FIGURE 2-1:
© 2007 Microchip Technology Inc.
CALL, RETURN
RETFIE, RETLW
MEMORY ORGANIZATION
Program Memory Organization
On-chip Program
Interrupt Vector
Stack Level 1
Stack Level 2
Stack Level 8
Access 0-3FFh
Reset Vector
PC<12:0>
Memory
PROGRAM MEMORY MAP
AND STACK FOR THE
PIC16F631
and
13
the
PIC16F631/677/685/687/689/690
first
0000h
0004h
0005h
03FFh
0400h
1FFFh
4K x 14
FIGURE 2-2:
CALL, RETURN
RETFIE, RETLW
On-chip Program
Interrupt Vector
Access 0-FFFh
Stack Level 1
Stack Level 2
Stack Level 8
Reset Vector
PC<12:0>
Memory
PROGRAM MEMORY MAP
AND STACK FOR THE
PIC16F685/689/690
13
DS41262D-page 25
0000h
0004h
0005h
0FFFh
1000h
1FFFh