PIC16F62X
14.0
SPECIAL FEATURES OF THE
CPU
The PIC16F62X 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. There is also circuitry to reset the
device if a brown-out occurs which provides 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 or through an interrupt. Several oscillator
options are also made available to allow the part to fit
the application. The ER oscillator option saves system
cost while the LP crystal option saves power. A set of
configuration bits are used to select various options.
Special circuits to deal with the needs of real time appli-
cations are what sets a microcontroller apart from other
processors. The PIC16F62X family has a host of such
features intended to maximize system reliability, mini-
mize cost through elimination of external components,
provide power saving operating modes and offer code
protection.
These are:
1.
2.
OSC selection
Reset
Power-on Reset (POR)
Power-up Timer (PWRT)
Oscillator Start-Up Timer (OST)
Brown-out Reset (BOD)
Interrupts
Watchdog Timer (WDT)
SLEEP
Code protection
ID Locations
In-circuit serial programming
3.
4.
5.
6.
7.
8.
©
1999 Microchip Technology Inc.
Preliminary
DS40300B-page 95
MICROCHIP [ MICROCHIP TECHNOLOGY ]
