PIC16C554-04E/SO Microchip Technology, PIC16C554-04E/SO Datasheet - Page 37

• Manufacturer Part Number: PIC16C554-04E/SO
• Description: IC MCU OTP 512X14 18SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C554-04E/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 13
• Program Memory Size: 896B (512 x 14)
• Program Memory Type: OTP
• Ram Size: 80 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 18-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -

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