PIC16C554-20I/SO Microchip Technology, PIC16C554-20I/SO Datasheet - Page 38

• Manufacturer Part Number: PIC16C554-20I/SO
• Description: IC MCU OTP 512X14 18SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C554-20I/SO

• 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: OTP
• Ram Size: 80 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 18-SOIC (7.5mm Width)
• Processor Series: PIC16C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 80 B
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 13
• Number Of Timers: 8
• Operating Supply Voltage: 2.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: ICE2000
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Details

PIC16C55X
6.4
6.4.1
A Power-on Reset pulse is generated on-chip when
V
take advantage of the POR, just tie the MCLR pin
through a resistor to V
RC components usually needed to create Power-on
Reset. A maximum rise time for V
Electrical Specifications for details.
The POR circuit does not produce internal RESET
when V
When the device starts normal operation (exits the
RESET condition), device operating parameters (volt-
age, frequency, temperature, etc.) must be met to
ensure operation. If these conditions are not met, the
device must be held in RESET until the operating con-
ditions are met.
For additional information, refer to Application Note
AN607 “Power-up Trouble Shooting”.
6.4.2
The Power-up Timer provides a fixed 72 ms (nominal)
timeout on power-up only, from POR. The Power-up
Timer operates on an internal RC oscillator. The chip is
kept in RESET as long as PWRT is active. The PWRT
delay allows the V
configuration bit, PWRTE can disable (if set) or enable
(if cleared or programmed) the Power-up Timer. The
Power-Up Time delay will vary from chip to chip and
due to V
DC parameters for details.
DS40143D-page 36
DD
rise is detected (in the range of 1.6V – 1.8V). To
DD
Power-on Reset (POR), Power-up
Timer (PWRT), Oscillator Start-up
Timer (OST)
DD
declines.
, temperature and process variation. See
POWER-ON RESET (POR)
POWER-UP TIMER (PWRT)
DD
to rise to an acceptable level. A
DD
. This will eliminate external
DD
is required. See
Preliminary
6.4.3
The Oscillator Start-Up Timer (OST) provides a 1024
oscillator cycle (from OSC1 input) delay after the
PWRT delay is over. This ensures that the crystal
oscillator or resonator has started and stabilized.
The OST timeout is invoked only for XT, LP and HS
modes and only on Power-on Reset or wake-up from
SLEEP.
6.4.4
On power-up, the timeout sequence is as follows: First
PWRT timeout is invoked after POR has expired, then
OST is activated. The total timeout will vary based on
oscillator configuration and PWRTE bit status. For
example, in RC mode with PWRTE bit erased (PWRT
disabled), there will be no timeout at all. Figure 6-7,
Figure 6-8 and Figure 6-9 depict timeout sequences.
Since the timeouts occur from the POR pulse, if MCLR
is kept low long enough, the timeouts will expire. Then
bringing MCLR high will begin execution immediately
(see Figure 6-8). This is useful for testing purposes or
to synchronize more than one PIC16C55X device oper-
ating in parallel.
Table 6-5 shows the RESET conditions for some spe-
cial registers, while Table 6-6 shows the RESET condi-
tions for all the registers.
OSCILLATOR START-UP TIMER
(OST)
TIMEOUT SEQUENCE
 2002 Microchip Technology Inc.