PIC16F87XA
FIGURE 4-2:
BLOCK DIAGRAM OF RA4/T0CKI PIN
CMCON<2:0> = ‘x01’ or ‘011’
C1OUT
Data Latch
Data Bus
1
0
D
Q
I/O pin(1)
N
WR PORTA
CK
Q
TRIS Latch
VSS
D
Q
WR TRISA
RD TRISA
Schmitt
Trigger
Input
Q
CK
Buffer
Q
D
EN
EN
RD PORTA
TMR0 Clock Input
Note 1: I/O pin has protection diodes to VSS only.
FIGURE 4-3:
BLOCK DIAGRAM OF RA5 PIN
CMCON<2:0> = ‘011’ or ‘101’
C2OUT
Data Latch
VDD
P
Data Bus
1
0
D
Q
WR PORTA
CK
Q
TRIS Latch
I/O pin(1)
N
D
Q
WR
TRISA
Schmitt
Trigger
Input
Q
CK
VSS
Buffer
RD TRISA
Q
D
EN
EN
RD PORTA
A/D Converter or SS Input
Note 1: I/O pin has protection diodes to VDD and VSS.
DS39582A-page 40
AdvanceInformation
2001 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
