PIC16C621A Microchip Technology Inc., PIC16C621A Datasheet - Page 29

• Manufacturer Part Number: PIC16C621A
• Description: Eprom-based 8-bit Cmos Microcontrollers
• Manufacturer: Microchip Technology Inc.

TABLE 5-1:
TABLE 5-2:
 2003 Microchip Technology Inc.
RA0/AN0
RA1/AN1
RA2/AN2/V
RA3/AN3
RA4/T0CKI
Legend: ST = Schmitt Trigger input
Address Name
05h
85h
1Fh
9Fh
Legend: — = Unimplemented locations, read as ‘0’, u = unchanged, x = unknown
Note:
Name
PORTA
TRISA
CMCON C2OUT C1OUT
VRCON
Shaded bits are not used by PORTA.
REF
PORTA FUNCTIONS
SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
Bit #
VREN
bit0
bit1
bit2
bit3
bit4
Bit 7
—
—
VROE VRR
Bit 6
—
—
Buffer
Type
ST
ST
ST
ST
ST
Bit 5
—
—
—
Input/output or comparator input
Input/output or comparator input
Input/output or comparator input or V
Input/output or comparator input/output
Input/output or external clock input for TMR0 or comparator output.
Output is open drain type.
TRISA
Bit 4
RA4
—
—
4
TRISA
Bit 3
RA3
VR3
CIS
3
TRISA
Bit 2
CM2
RA2
VR2
2
TRISA
Bit 1
CM1
RA1
VR1
Function
1
REF
TRISA
Bit 0
CM0
RA0
VR0
output
0
PIC16C62X
---x 0000
---1 1111
00-- 0000
000- 0000
Value on
POR
DS30235J-page 27
---u 0000
---1 1111
00-- 0000
000- 0000
Value on
All Other
RESETS