PIC16C554/JW Microchip Technology, PIC16C554/JW Datasheet - Page 37
![IC MCU EPROM 512X14 18CDIP](/photos/12/13/121351/150-18-cdip_sml.jpg)
PIC16C554/JW
Manufacturer Part Number
PIC16C554/JW
Description
IC MCU EPROM 512X14 18CDIP
Manufacturer
Microchip Technology
Series
PIC® 16Cr
Specifications of PIC16C554/JW
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Peripherals
POR, WDT
Number Of I /o
13
Program Memory Size
896B (512 x 14)
Program Memory Type
EPROM, UV
Ram Size
80 x 8
Voltage - Supply (vcc/vdd)
2.5 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
18-CDIP (0.300", 7.62mm) Window
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Connectivity
-
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6.3
The PIC16C55X differentiates between various kinds
of RESET:
• Power-on Reset (POR)
• MCLR Reset during normal operation
• MCLR Reset during SLEEP
• WDT Reset (normal operation)
• WDT wake-up (SLEEP)
Some registers are not affected in any RESET condi-
tion; their status is unknown on POR and unchanged in
any other RESET. Most other registers are reset to a
“RESET state” on Power-on Reset, on MCLR or WDT
Reset and on MCLR Reset during SLEEP. They are not
affected by a WDT wake-up, since this is viewed as the
resumption of normal operation. TO and PD bits are set
or cleared differently in different RESET situations as
indicated in Table 6-4. These bits are used in software
to determine the nature of the RESET. See Table 6-6
for a full description of RESET states of all registers.
FIGURE 6-6:
2002 Microchip Technology Inc.
Note 1: This is a separate oscillator from the RC oscillator of the CLKIN pin.
V
MCLR/
OSC1/
CLKIN
PP
V
Pin
DD
Pin
RESET
On-chip
RC OSC
OST/PWRT
V
Module
(1)
detect
WDT
DD
rise
OST
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
PWRT
10-bit Ripple-counter
Reset
10-bit Ripple-counter
WDT
Timeout
Power-on Reset
External
Reset
SLEEP
Preliminary
Enable PWRT
Enable OST
A simplified block diagram of the on-chip RESET circuit
is shown in Figure 6-6.
The MCLR Reset path has a noise filter to detect and
ignore small pulses. See Table 10-3 for pulse width
specification.
See Table 6-3 for timeout situations.
PIC16C55X
S
R
DS40143D-page 35
Q
Chip_Reset
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