|
PIC16F676-I Datasheet, PDF (55/132 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers | |||
|
◁ |
9.0 SPECIAL FEATURES OF THE
CPU
Certain special circuits that deal with the needs of real
time applications are what sets a microcontroller apart
from other processors. The PIC16F630/676 family has
a host of such features intended to:
⢠maximize system reliability
⢠minimize cost through elimination of external
components
⢠provide power-saving operating modes and offer
code protection
These features are:
⢠Oscillator selection
⢠Reset
- Power-on Reset (POR)
- Power-up Timer (PWRT)
- Oscillator Start-up Timer (OST)
- Brown-out Detect (BOD)
⢠Interrupts
⢠Watchdog Timer (WDT)
⢠Sleep
⢠Code protection
⢠ID Locations
⢠In-Circuit Serial Programmingâ¢
PIC16F630/676
The PIC16F630/676 has a Watchdog Timer that is
controlled by Configuration bits. It runs off its own RC
oscillator for added reliability. There are two timers that
offer necessary delays on power-up. One is the
Oscillator Start-up Timer (OST), intended to keep the
chip in Reset until the crystal oscillator is stable. The
other is the Power-up Timer (PWRT), which provides a
fixed delay of 72 ms (nominal) on power-up only,
designed to keep the part in Reset while the power
supply stabilizes. There is also circuitry to reset the
device if a brown-out occurs, which can provide at least
a 72 ms Reset. With these three functions on-chip,
most applications need no external Reset circuitry.
The Sleep mode is designed to offer a very low current
Power-down mode. The user can wake-up from Sleep
through:
⢠External Reset
⢠Watchdog Timer wake-up
⢠An interrupt
Several oscillator options are also made available to
allow the part to fit the application. The INTOSC option
saves system cost while the LP crystal option saves
power. A set of Configuration bits are used to select
various options (see Register 9-1).
ï£ 2010 Microchip Technology Inc.
DS40039F-page 55
|
▷ |