PIC18F4539 Datasheet, PDF (86/322 Pages) Microchip Technology – Enhanced FLASH Microcontrollers with Single Phase Induction Motor Control Kernel

PIC18FXX39
FIGURE 9-2:
BLOCK DIAGRAM OF
RA4/T0CKI PIN
Data
Bus
WR LATA
or PORTA
WR TRISA
RD TRISA
RD LATA
DQ
CK Q
Data Latch
DQ
CK Q
TRIS Latch
I/O pin⁽¹⁾
N
VSS
Schmitt
Trigger
Input
Buffer
RD PORTA
Q
D
ENEN
TMR0 Clock Input
Note 1: I/O pin has protection diode to VSS only.
FIGURE 9-3:
ECRA6 or
RCRA6 Enable
Data
Bus
RD LATA
BLOCK DIAGRAM OF
RA6 PIN
WR LATA
or
PORTA
D
Q
CK Q
Data Latch
WR
TRISA
D
Q
CK Q
TRIS Latch
VDD
P
N I/O pin⁽¹⁾
VSS
RD TRISA
ECRA6 or
RCRA6
Enable
TTL
Input
Buffer
RD PORTA
Q
D
EN
Note 1: I/O pins have protection diodes to VDD and VSS.
DS30485A-page 84
Preliminary
 2002 Microchip Technology Inc.