PIC16C65A Microchip Technology, PIC16C65A Datasheet - Page 123
PIC16C65A
Manufacturer Part Number
PIC16C65A
Description
8-Bit CMOS Microcontrollers
Manufacturer
Microchip Technology
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13.0
What sets a microcontroller apart from other proces-
sors are special circuits to deal with the needs of real-
time applications. The PIC16CXX family has a host of
such features intended to maximize system reliability,
minimize cost through elimination of external compo-
nents, provide power saving operating modes and offer
code protection. These are:
• Oscillator selection
• Reset
• Interrupts
• Watchdog Timer (WDT)
• SLEEP mode
• Code protection
• ID locations
• In-circuit serial programming
The PIC16CXX has a Watchdog Timer which can be
shut off only through configuration bits. It runs off its
own RC oscillator for added reliability. There are two
FIGURE 13-1: CONFIGURATION WORD FOR PIC16C61
Applicable Devices
61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67
1997 Microchip Technology Inc.
- Power-on Reset (POR)
- Power-up Timer (PWRT)
- Oscillator Start-up Timer (OST)
- Brown-out Reset (BOR)
bit13
bit 13-5: Unimplemented: Read as '1'
bit 4:
bit 3:
bit 2:
bit 1-0:
—
SPECIAL FEATURES OF THE
CPU
—
CP0: Code protection bit
1 = Code protection off
0 = All memory is code protected, but 00h - 3Fh is writable
PWRTE: Power-up Timer Enable bit
1 = Power-up Timer enabled
0 = Power-up Timer disabled
WDTE: Watchdog Timer Enable bit
1 = WDT enabled
0 = WDT disabled
FOSC1:FOSC0: Oscillator Selection bits
11 = RC oscillator
10 = HS oscillator
01 = XT oscillator
00 = LP oscillator
—
—
—
—
—
—
—
CP0 PWRTE WDTE FOSC1 FOSC0
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 pro-
vides 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 timers on-chip, most
applications need no external reset circuitry.
SLEEP mode is designed to offer a very low current
power-down mode. The user can wake 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.
13.1
The configuration bits can be programmed (read as '0')
or left unprogrammed (read as '1') to select various
device configurations. These bits are mapped in pro-
gram memory location 2007h.
The user will note that address 2007h is beyond the
user program memory space. In fact, it belongs to the
special test/configuration memory space (2000h -
3FFFh), which can be accessed only during program-
ming.
Applicable Devices
61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67
Configuration Bits
bit0
PIC16C6X
Register:
Address
DS30234D-page 123
CONFIG
2007h
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