PIC16F627A_05 Datasheet, PDF (35/180 Pages) Microchip Technology – Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F627A/628A/648A
FIGURE 5-4:
BLOCK DIAGRAM OF RA4/T0CKI/CMP2 PIN
Data
Bus
WR
PORTA
D
Q
CK Q
Data Latch
Comparator Mode = 110 (CMCON Reg.)
Comparator Output
1
0
D
Q
WR
TRISA
CK Q
TRIS Latch
N
RA4 Pin
Vss
Vss
RD TRISA
RD PORTA
TMR0 Clock Input
FIGURE 5-5:
BLOCK DIAGRAM OF THE
RA5/MCLR/VPP PIN
MCLR
circuit
Program
mode
MCLRE (Configuration Bit)
MCLR Filter
Schmitt Trigger
Input Buffer
HV Detect
RA5/MCLR/VPP
Data
Bus
VSS
RD
TRISA
RD
PORTA
VSS
QD
EN
Schmitt Trigger
Input Buffer
Q
D
EN
FIGURE 5-6:
BLOCK DIAGRAM OF
RA6/OSC2/CLKOUT PIN
From OSC1
CLKOUT(FOSC/4)
OSC
Circuit
VDD
1
WR
DQ
0
PORTA
CK Q
FOSC =
101, 111
(2)
Data
Latch
VSS
WR
TRISA
RD
TRISA
DQ
CK Q
TRIS Latch
FOSC =
011, 100, 110 ⁽¹⁾
RD PORTA
QD
EN
Schmitt
Trigger
Input Buffer
Note 1: INTOSC with RA6 = I/O or RC with RA6 = I/O.
2: INTOSC with RA6 = CLKOUT or RC with
RA6 = CLKOUT.
© 2005 Microchip Technology Inc.
DS40044D-page 33