PIC16C774T-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C774T-I/SO

28/40-Pin, 8-Bit CMOS Microcontrollers w/ 12-Bit A/D

Microchip Technology 

PIC16C77X

12.2.3 RC OSCILLATOR

For timing insensitive applications the “RC” device

option offers additional cost savings. The RC oscillator

frequency is a function of the supply voltage, the resis-

tor (REXT) and capacitor (CEXT) values, and the operat-

ing temperature. In addition to this, the oscillator

frequency will vary from unit to unit due to normal pro-

cess parameter variation. Furthermore, the difference

in lead frame capacitance between package types will

also affect the oscillation frequency, especially for low

CEXT values. These factors and the variation due to tol-

erances of external R and C components used need to

be taken into account for each application. Figure 12-4

shows how the R/C combination is connected to the

PIC16C77X.

FIGURE 12-4: RC OSCILLATOR MODE

VDD

Rext

Cext

VSS

OSC1

Internal

clock

PIC16C77X

OSC2/CLKOUT

Fosc/4

DS30275B-page 130

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