PIC16C84-04I/P Microchip Technology, PIC16C84-04I/P Datasheet - Page 35

• Manufacturer Part Number: PIC16C84-04I/P
• Description: IC MIC CTL EEPM 1K 4MHZ IT 18DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C84-04I/P

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 13
• Program Memory Size: 1.75KB (1K x 14)
• Program Memory Type: EEPROM
• Eeprom Size: 64 x 8
• Ram Size: 36 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 18-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification
• Data Converters: -
• Connectivity: -

8.0
What sets a microcontroller apart from other
processors are special circuits to deal with the needs of
real time applications. The PIC16C84 has a host of
such features intended to maximize system reliability,
minimize
FIGURE 8-1:
components, provide power saving operating modes
and offer code protection. These features are:
• OSC selection
• Reset
• Interrupts
• Watchdog Timer (WDT)
• SLEEP
• Code protection
• ID locations
• In-circuit serial programming
The PIC16C84 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
timers that offer necessary delays on power-up. One is
the Oscillator Start-up Timer (OST), intended to keep
1997 Microchip Technology Inc.
- Power-on Reset (POR)
- Power-up Timer (PWRT)
- Oscillator Start-up Timer (OST)
bit13
bit 13:5 Unimplemented: Read as '1'
bit 4
bit 3
bit 2
bit 1:0
U-1
—
SPECIAL FEATURES OF THE
CPU
U-1
cost
—
CP: Code Protection bit
1 = Code protection off
0 = All memory is code protected
PWRTE: Power-up Timer Enable bit
1 = Power-up timer is enabled
0 = Power-up timer is 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
through
CONFIGURATION WORD
U-1
—
U-1
—
elimination
U-1
—
U-1
—
of
U-1
—
external
U-1
—
U-1
—
R/P-u
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. This
design keeps the device in reset while the power supply
stabilizes. With these two timers on-chip, most
applications need no external reset circuitry.
SLEEP mode offers a very low current power-down
mode. The user can wake-up from SLEEP through
external reset, Watchdog Timer time-out or through an
interrupt. Several oscillator options are provided 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 the various options.
8.1
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
program memory location 2007h.
Address 2007h is beyond the user program memory
space and it belongs to the special test/configuration
memory space (2000h - 3FFFh). This space can only
be accessed during programming.
To find out how to program the PIC16C84, refer to
PIC16C84 EEPROM Memory Programming Specifica-
tion (DS30189).
CP
PWRTE WDTE FOSC1 FOSC0
R/P-u
Configuration Bits
R/P-u
R = Readable bit
P = Programmable bit
U = Unimplemented bit,
- n = Value at POR reset
R/P-u
u = unchanged
read as ‘1’
PIC16C84
R/P-u
bit0
DS30445C-page 35