PIC16F631-I/P Microchip Technology Inc., PIC16F631-I/P Datasheet - Page 68

• 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

PIC16F631/677/685/687/689/690
4.2.5.4
Figure 4-4 shows the diagram for this pin. The
RA3/MCLR/V
of the following:
• a general purpose input
• as Master Clear Reset with weak pull-up
FIGURE 4-4:
DS41262D-page 66
Data Bus
PORTA
IOCA
IOCA
TRISA
WR
RD
RD
RD
Interrupt-on-
Change
D
CK
RA3/MCLR/V
PP
Q
Q
pin is configurable to function as one
Reset
MCLRE
BLOCK DIAGRAM OF RA3
V
SS
PP
RD PORTA
MCLRE
Q
Q
MCLRE
EN
EN
D
D
V
DD
Weak
V
SS
Q3
Input
Pin
4.2.5.5
Figure 4-5 shows the diagram for this pin. The
RA4/AN3/T1G/OSC2/CLKOUT pin is configurable to
function as one of the following:
• a general purpose I/O
• an analog input for the ADC (except PIC16F631)
• a TMR1 gate input
• a crystal/resonator connection
• a clock output
FIGURE 4-5:
Data Bus
PORTA
PORTA
WPUA
WPUA
TRISA
TRISA
IOCA
IOCA
Note 1: CLK modes are XT, HS, LP, LPTMR1 and CLKOUT
WR
WR
WR
WR
RD
RD
RD
RD
Interrupt-on-
Change
2: With CLKOUT option.
3: ANSEL determines Analog Input mode.
4: Not implemented on PIC16F631.
Enable.
D
D
D
D
To T1G
To A/D Converter
CK
CK
CK
CK
RA4/AN3/T1G/OSC2/CLKOUT
Q
Q
Q
Q
Q
Q
Q
Q
Input Mode
BLOCK DIAGRAM OF RA4
Analog
© 2007 Microchip Technology Inc.
OSC1
(4)
F
OSC
INTOSC/
RC/EC
CLKOUT
CLKOUT
Enable
(3)
Enable
Input Mode
/4
RABPU
RD PORTA
CLKOUT
Enable
Analog
Oscillator
Circuit
Modes
Q
Q
1
0
(2)
CLK
EN
EN
(1)
D
D
V
DD
Weak
V
V
DD
SS
Q3
I/O Pin