PIC16F688

Manufacturer Part NumberPIC16F688
ManufacturerMicrochip Technology Inc.
PIC16F688 datasheet
 


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Page 41/202:

BLOCK DIAGRAM OF RA4

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4.2.5.4
RA3/MCLR/V
PP
Figure 4-4 shows the diagram for this pin. The RA3 pin
is configurable to function as one of the following:
• a general purpose input
• as Master Clear Reset with weak pull-up
FIGURE 4-4:
BLOCK DIAGRAM OF RA3
MCLRE
Data Bus
MCLRE
Reset
RD
V
SS
TRISA
MCLRE
RD
PORTA
D
Q
Q
D
WR
CK
Q
IOCA
EN
RD
IOCA
Q
D
EN
Interrupt-on-
change
RD PORTA
© 2007 Microchip Technology Inc.
4.2.5.5
RA4/AN3/T1G/OSC2/CLKOUT
Figure 4-5 shows the diagram for this pin. The RA4 pin
is configurable to function as one of the following:
• a general purpose I/O
• an analog input for the A/D
• a Timer1 gate input
• a crystal/resonator connection
• a clock output
V
DD
FIGURE 4-5:
Weak
Input
pin
Data Bus
D
V
SS
WR
CK
WPUA
RD
WPUA
Q3
D
WR
CK
PORTA
D
WR
CK
TRISA
RD
TRISA
RD
PORTA
D
WR
CK
IOCA
RD
IOCA
Interrupt-on-
change
To T1G
To A/D Converter
Note 1: CLK modes are XT, HS, LP, LPTMR1 and CLKOUT
Enable.
2: With CLKOUT option.
3: Analog Input mode is ANSEL.
PIC16F688

BLOCK DIAGRAM OF RA4

(3)
Analog
Input Mode
(1)
CLK
Modes
Q
V
DD
Q
Weak
RAPU
Oscillator
Circuit
OSC1
V
DD
CLKOUT
Enable
Fosc/4
1
Q
0
I/O pin
Q
CLKOUT
Enable
V
SS
Q
INTOSC/
(2)
RC/EC
Q
CLKOUT
Enable
(3)
Analog
Input Mode
Q
Q
D
Q
EN
Q3
Q
D
EN
RD PORTA
DS41203C-page 39