PIC16F720_13 Datasheet, PDF (53/254 Pages) Microchip Technology – 20-Pin Flash Microcontrollers

PIC16(L)F720/721
FIGURE 6-6:
Data Bus
DQ
WR
WPUA
CK _Q
RD
WPUA
BLOCK DIAGRAM OF RA5
INTOSC
mode
VDD
Weak
RABPU
DQ
WR
PORTA
CK _Q
WR
TRISA
DQ
CK _Q
RD
TRISA
VDD
INTOSC
mode
I/O Pin
VSS
RD
PORTA
DQ
WR
IOCA
CK _Q
RD
IOCA
Interrupt-on-
Change
QD
EN
Q3
QD
EN
RD PORTA
To TMR1 or CLKIN
TABLE 6-1: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Register
on Page
ANSELA
—
—
— ANSA4
—
ANSA2 ANSA1 ANSA0
47
OPTION_REG RABPU INTEDG T0CS T0SE PSA
PS2
PS1
PS0
21
PORTA
—
—
RA5
RA4
RA3
RA2
RA1
RA0
46
TRISA
—
— TRISA5 TRISA4
—
TRISA2 TRISA1 TRISA0
46
Legend: x = unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by
PORTA.
 2010-2013 Microchip Technology Inc.
DS41430D-page 53