PIC16C54-XT/P Microchip Technology, PIC16C54-XT/P Datasheet - Page 39
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PIC16C54-XT/P
Manufacturer Part Number
PIC16C54-XT/P
Description
IC MCU OTP 512X12 18DIP
Manufacturer
Microchip Technology
Series
PIC® 16Cr
Specifications of PIC16C54-XT/P
Core Size
8-Bit
Program Memory Size
768B (512 x 12)
Core Processor
PIC
Speed
4MHz
Peripherals
POR, WDT
Number Of I /o
12
Program Memory Type
OTP
Ram Size
25 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 6.25 V
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
18-DIP (0.300", 7.62mm)
Controller Family/series
PIC16C
No. Of I/o's
12
Ram Memory Size
25Byte
Cpu Speed
4MHz
No. Of Timers
1
Package
18PDIP
Device Core
PIC
Family Name
PIC16
Maximum Speed
4 MHz
Operating Supply Voltage
3.3|5 V
Data Bus Width
8 Bit
Number Of Programmable I/os
12
Number Of Timers
1
Core
PIC
Processor Series
PIC16C
Maximum Clock Frequency
40 MHz
Data Ram Size
25 B
Data Rom Size
512 B
Mounting Style
Through Hole
Height
3.3 mm
Length
22.86 mm
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Supply Voltage (max)
6.25 V
Supply Voltage (min)
3 V
Width
6.35 mm
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Connectivity
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16C54-XT/P
Manufacturer:
MICROCHI
Quantity:
25
Company:
Part Number:
PIC16C54-XT/P
Manufacturer:
ST
Quantity:
110
Part Number:
PIC16C54-XT/P
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
7.5
The Device Reset Timer (DRT) provides a fixed 18 ms
nominal time-out on reset. The DRT operates on an
internal RC oscillator. The processor is kept in RESET
as long as the DRT is active. The DRT delay allows
V
stabilize.
Oscillator circuits based on crystals or ceramic
resonators require a certain time after power-up to
establish a stable oscillation. The on-chip DRT keeps
the device in a RESET condition for approximately 18
ms after the voltage on the MCLR/V
reached a logic high (V
networks connected to the MCLR input are not
required in most cases, allowing for savings in
cost-sensitive and/or space restricted applications.
The Device Reset time delay will vary from device to
device due to V
variation. See AC parameters for details.
The DRT will also be triggered upon a Watchdog Timer
time-out. This is particularly important for applications
using the WDT to wake the PIC16C5X from SLEEP
mode automatically.
DD
1998 Microchip Technology Inc.
to rise above V
Device Reset Timer (DRT)
DD
DD
, temperature, and process
min., and for the oscillator to
IH
) level. Thus, external RC
PP
pin has
Preliminary
7.6
The Watchdog Timer (WDT) is a free running on-chip
RC oscillator which does not require any external
components. This RC oscillator is separate from the
RC oscillator of the OSC1/CLKIN pin. That means that
the WDT will run even if the clock on the OSC1/CLKIN
and OSC2/CLKOUT pins have been stopped, for
example, by execution of a SLEEP instruction. During
normal operation or SLEEP, a WDT reset or wake-up
reset generates a device RESET.
The TO bit (STATUS<4>) will be cleared upon a
Watchdog Timer reset.
The
programming the configuration bit WDTE as a '0'
(Section 7.1). Refer to the PIC16C5X Programming
Specifications
determine how to access the configuration word.
7.6.1
The WDT has a nominal time-out period of 18 ms,
(with no prescaler). If a longer time-out period is
desired, a prescaler with a division ratio of up to 1:128
can be assigned to the WDT (under software control)
by writing to the OPTION register. Thus, time-out a
period of a nominal 2.3 seconds can be realized.
These periods vary with temperature, V
part-to-part process variations (see DC specs).
Under worst case conditions (V
= Max., max. WDT prescaler), it may take several
seconds before a WDT time-out occurs.
7.6.2
The CLRWDT instruction clears the WDT and the
postscaler, if assigned to the WDT, and prevents it
from timing out and generating a device RESET.
The SLEEP instruction resets the WDT and the
postscaler, if assigned to the WDT. This gives the
maximum SLEEP time before a WDT wake-up reset.
WDT
Watchdog Timer (WDT) (not
implemented on PIC16C52)
WDT PERIOD
WDT PROGRAMMING CONSIDERATIONS
can
(Literature
be
permanently
PIC16C5X
Number
DD
= Min., Temperature
DS30453B-page 39
DS30190)
disabled
DD
and
by
to