PIC16C55X(A)
The PIC16C55X(A) has a Watchdog Timer which 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. With these two functions on-chip,
most applications need no external reset circuitry.
7.0
SPECIAL FEATURES OF THE
CPU
What sets
a
microcontroller apart from other
processors are special circuits to deal with the needs of
real time applications. The PIC16C55X(A) 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 are:
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 or through an interrupt. Several oscillator
options are also made available to allow the part to fit
the application. The RC oscillator option saves system
cost while the LP crystal option saves power. A set of
configuration bits are used to select various options.
1. OSC selection
2. Reset
Power-on Reset (POR)
Power-up Timer (PWRT)
Oscillator Start-Up Timer (OST)
3. Interrupts
4. Watchdog Timer (WDT)
5. SLEEP
6. Code protection
7. ID Locations
8. In-circuit serial programming™
1997 Microchip Technology Inc.
Preliminary
DS40143B-page 35
MICROCHIP [ MICROCHIP ]
