PIC18C452-E/PT Microchip Technology, PIC18C452-E/PT Datasheet - Page 28
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PIC18C452-E/PT
Manufacturer Part Number
PIC18C452-E/PT
Description
IC MCU OTP 16KX16 A/D 44TQFP
Manufacturer
Microchip Technology
Series
PIC® 18Cr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16C770-ISO.pdf
(8 pages)
3.PIC18C242-ISO.pdf
(305 pages)
4.PIC18C242-ISO.pdf
(12 pages)
Specifications of PIC18C452-E/PT
Core Processor
PIC
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
33
Program Memory Size
32KB (16K x 16)
Program Memory Type
OTP
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 125°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Other names
PIC18C452E/PT
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18C452-E/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
- PIC16F616T-ISL PDF datasheet
- PIC16C770-ISO PDF datasheet #2
- PIC18C242-ISO PDF datasheet #3
- PIC18C242-ISO PDF datasheet #4
- Current page: 28 of 305
- Download datasheet (6Mb)
PIC18CXX2
3.1
A Power-on Reset pulse is generated on-chip when
V
cuitry, just tie the MCLR pin directly (or through a resis-
tor) to V
usually needed to create a Power-on Reset delay. A
minimum rise rate for V
D004). For a slow rise time, see Figure 3-2.
When the device starts normal operation (i.e., 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 condi-
tions are met.
FIGURE 3-2:
3.2
The Power-up Timer provides a fixed nominal time-out
(parameter #33) only on power-up from the POR. The
Power-up Timer operates on an internal RC oscillator.
The chip is kept in reset as long as the PWRT is active.
The PWRT’s time delay allows V
able level. A configuration bit is provided to enable/
disable the PWRT.
The power-up time delay will vary from chip-to-chip due
to V
parameter #33 for details.
DS39026C-page 26
DD
Note 1: External Power-on Reset circuit is required
DD
rise is detected. To take advantage of the POR cir-
, temperature and process variation. See DC
DD
Power-on Reset (POR)
Power-up Timer (PWRT)
2: R < 40 k is recommended to make sure that
3: R1 = 100
. This will eliminate external RC components
D
only if the V
The diode D helps discharge the capacitor
quickly when V
the voltage drop across R does not violate
the device’s electrical specification.
ing into MCLR from external capacitor C in
the event of MCLR/V
to Electrostatic Discharge (ESD) or Electrical
Overstress (EOS).
V
DD
R
C
EXTERNAL POWER-ON
RESET CIRCUIT (FOR
SLOW V
to 1 k will limit any current flow-
DD
DD
DD
R1
power-up slope is too slow.
powers down.
is specified (parameter
DD
PP
DD
PIC18CXXX
MCLR
pin breakdown, due
to rise to an accept-
POWER-UP)
3.3
The Oscillator Start-up Timer (OST) provides a 1024
oscillator cycle (from OSC1 input) delay after the
PWRT delay is over (parameter #32). This ensures that
the crystal oscillator or resonator has started and
stabilized.
The OST time-out is invoked only for XT, LP and HS
modes and only on Power-on Reset or wake-up from
SLEEP.
3.4
With the PLL enabled, the time-out sequence following
a Power-on Reset is different from other oscillator
modes. A portion of the Power-up Timer is used to pro-
vide a fixed time-out that is sufficient for the PLL to lock
to the main oscillator frequency. This PLL lock time-out
(T
up time-out (OST).
3.5
A configuration bit, BOREN, can disable (if clear/
programmed), or enable (if set) the Brown-out Reset
circuitry. If V
than parameter #35, the brown-out situation will reset
the chip. A RESET may not occur if V
parameter D005 for less than parameter #35. The chip
will remain in Brown-out Reset until V
BV
will keep the chip in RESET an additional time delay
(parameter #33). If V
Power-up Timer is running, the chip will go back into a
Brown-out Reset and the Power-up Timer will be initial-
ized. Once V
will execute the additional time delay.
3.6
On power-up, the time-out sequence is as follows:
First, PWRT time-out is invoked after the POR time
delay has expired. Then, OST is activated. The total
time-out will vary based on oscillator configuration and
the status of the PWRT. For example, in RC mode with
the PWRT disabled, there will be no time-out at all.
Figure 3-3, Figure 3-4, Figure 3-5, Figure 3-6 and
Figure 3-7 depict time-out sequences on power-up.
Since the time-outs occur from the POR pulse, if MCLR
is kept low long enough, the time-outs will expire.
Bringing MCLR high will begin execution immediately
(Figure 3-5). This is useful for testing purposes or to
synchronize more than one PIC18CXXX device oper-
ating in parallel.
Table 3-2 shows the RESET conditions for some
Special Function Registers, while Table 3-3 shows the
RESET conditions for all the registers.
PLL
DD
) is typically 2 ms and follows the oscillator start-
. The Power-up Timer will then be invoked and
Oscillator Start-up Timer (OST)
PLL Lock Time-out
Brown-out Reset (BOR)
Time-out Sequence
DD
DD
falls below parameter D005 for greater
rises above BV
DD
drops below BV
2001 Microchip Technology Inc.
DD
, the Power-up Timer
DD
DD
DD
rises above
falls below
while the
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