PIC16F688-E/SL 查看數據表（PDF） - Microchip Technology

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PIC16F688-E/SL

14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F688

FIGURE 3-9:

FSCM TIMING DIAGRAM

Sample Clock

System

Clock

Output

Clock Monitor Output

(Q)

OSCFIF

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

—

—

—

TUN4 TUN3 TUN2 TUN1 TUN0 ---0 0000 ---u uuuu

PIE1

EEIE ADIE RCIE

C2IE

C1IE OSFIE TXIE TMR1IE 0000 0000 0000 0000

PIR1

EEIF

ADIF RCIF

C2IF

C1IF OSFIF TXIF TMR1IF 0000 0000 0000 0000

Legend:

Note 1:

2:

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.

DS41203D-page 32

© 2007 Microchip Technology Inc.

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