PIC16F636-I Datasheet, PDF (48/234 Pages) Microchip Technology – 8/14-Pin, Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC12F635/PIC16F636/639
FIGURE 3-9:
FSCM TIMING DIAGRAM
Sample Clock
System
Clock
Output
Clock Monitor Output
(Q)
OSFIF
Oscillator
Failure
Failure
Detected
Note:
Test
Test
Test
The system clock is normally at a much higher frequency than the sample clock. The relative frequencies in
this example have been chosen for clarity.
TABLE 3-2: SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
Value on
all other
Resets⁽¹⁾
CONFIG⁽²⁾
CPD
CP MCLRE PWRTE WDTE FOSC2 FOSC1 FOSC0
—
—
INTCON
GIE
PEIE T0IE
INTE RAIE
T0IF
INTF
RAIF 0000 000x 0000 000x
OSCCON
—
IRCF2 IRCF1 IRCF0 OSTS HTS
LTS
SCS -110 x000 -110 x000
OSCTUNE
PIE1
PIR1
—
EEIE
EEIF
—
LVDIE
LVDIF
—
CRIE
CRIF
TUN4
C2IE⁽³⁾
C2IF⁽³⁾
TUN3
C1IE
C1IF
TUN2
OSFIE
OSFIF
TUN1
—
—
TUN0
TMR1IE
TMR1IF
---0 0000
000- 00-0
000- 00-0
---u uuuu
000- 00-0
000- 00-0
Legend:
Note 1:
2:
3:
x = unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by oscillators.
Other (non Power-up) Resets include MCLR Reset and Watchdog Timer Reset during normal operation.
See Configuration Word register (CONFIG) for operation of all register bits.
PIC16F636/639 only.
DS41232D-page 46
© 2007 Microchip Technology Inc.