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PIC16F628-20/P Datasheet(PDF) 33 Page - Microchip Technology

Part # PIC16F628-20/P
Description  FLASH-Based 8-Bit CMOS Microcontrollers
PDF  160 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F628-20/P Datasheet(HTML) 33 Page - Microchip Technology

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© 1999 Microchip Technology Inc.
Preliminary
DS40300B-page 33
PIC16F62X
TABLE 5-1:
PORTA FUNCTIONS
TABLE 5-2:
SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
Name
Bit #
Buffer
Type
Function
RA0/AN0
bit0
ST
Bi-directional I/O port/comparator input
RA1/AN1
bit1
ST
Bi-directional I/O port/comparator input
RA2/AN2/VREF
bit2
ST
Bi-directional I/O port/analog/comparator input or VREF output
RA3/AN3
bit3
ST
Bi-directional I/O port/analog/comparator input/comparator output
RA4/T0CKI
bit4
ST
Bi-directional I/O port/external clock input for TMR0 or comparator output.
Output is open drain type.
RA5/MCLR/THV
bit5
ST
Input port/master clear (reset input/programming voltage input. When
configured as MCLR, this pin is an active low reset to the device. Voltage
on MCLR/THV must not exceed VDD during normal device operation.
RA6/OSC2/CLK-
OUT
bit6
ST
Bi-directional I/O port/Oscillator crystal output. Connects to crystal or res-
onator in crystal oscillator mode. In ER mode, OSC2 pin outputs CLKOUT
which has 1/4 the frequency of OSC1, and denotes the instruction cycle
rate.
RA7/OSC1/CLKIN
bit7
ST
Bi-directional I/O port/oscillator crystal input/external clock source input.
Legend: ST = Schmitt Trigger input
Address Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR
Value on
All Other
Resets
05h
PORTA
RA7
RA6
RA5
RA4
RA3
RA2
RA1
RA0
xxxx 0000
xxxu 0000
85h
TRISA
TRISA7
TRISA6
—
TRISA4
TRISA3
TRISA2
TRISA1
TRISA0
11-1 1111
11-1 1111
1Fh
CMCON
C2OUT
C1OUT
C2INV
C1INV
CIS
CM2
CM1
CM0
0000 0000
0000 0000
9Fh
VRCON
VREN
VROE
VRR
—
VR3
VR2
VR1
VR0
000- 0000
000- 0000
Legend: — = Unimplemented locations, read as ‘0’, u = unchanged, x = unknown
Note:
Shaded bits are not used by PORTA.



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