pic24hj12gp202 Microchip Technology Inc., pic24hj12gp202 Datasheet - Page 168
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pic24hj12gp202
Manufacturer Part Number
pic24hj12gp202
Description
High-performance, 16-bit Digital Signal Controllers
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC24HJ12GP202.pdf
(234 pages)
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PIC24HJ12GP201/202
18.2
All of the PIC24HJ12GP201/202 devices power their
core digital logic at a nominal 2.5V. This can create a
conflict for designs that are required to operate at a
higher typical voltage, such as 3.3V. To simplify system
design, all devices in the PIC24HJ12GP201/202 family
incorporate an on-chip regulator that allows the device
to run its core logic from V
The regulator provides power to the core from the other
V
(less than 5 ohms) capacitor (such as tantalum or
ceramic) must be connected to the V
(Figure 18-1). This helps to maintain the stability of the
regulator. The recommended value for the filter capac-
itor is provided in Table 21-13 located in Section 21.1
“DC Characteristics”.
On a POR
voltage regulator to generate an output voltage. During
this time, designated as T
disabled. T
resumes operation after any power-down.
FIGURE 18-1:
DS70282B-page 166
DD
Note 1:
pins. When the regulator is enabled, a low-ESR
On-Chip Voltage Regulator
,
STARTUP
it takes approximately 20 μs for the on-chip
C
F
These are typical operating voltages. Refer
to TABLE 21-13: “Internal Voltage Regu-
lator Specifications” located in
Section 21.1 “DC Characteristics” for the
full operating ranges of V
3.3V
is applied every time the device
CONNECTIONS FOR THE
ON-CHIP VOLTAGE
REGULATOR
V
V
V
DD
DDCORE
SS
DD
PIC24H
STARTUP
.
/V
CAP
, code execution is
DD
DDCORE
and V
(1)
DDCORE
/V
CAP
.
Preliminary
pin
18.3
The Brown-out Reset (BOR) module is based on an
internal voltage reference circuit that monitors the reg-
ulated voltage V
module is to generate a device Reset when a brown-
out condition occurs. Brown-out conditions are gener-
ally caused by glitches on the AC mains (for example,
missing portions of the AC cycle waveform due to bad
power transmission lines, or voltage sags due to exces-
sive current draw when a large inductive load is turned
on).
A BOR generates a Reset pulse, which resets the
device. The BOR selects the clock source, based on
the device Configuration bit values (FNOSC<2:0> and
POSCMD<1:0>).
If an oscillator mode is selected, the BOR activates the
Oscillator Start-up Timer (OST). The system clock is
held until OST expires. If the PLL is used, the clock is
held until the LOCK bit (OSCCON<5>) is ‘1’.
Concurrently, the PWRT time-out (TPWRT) will be
applied before the internal Reset is released. If TPWRT
= 0 and a crystal oscillator is being used, a nominal
delay of TFSCM = 100 is applied. The total delay in this
case is TFSCM.
The BOR Status bit (RCON<1>) is set to indicate that a
BOR has occurred. The BOR circuit, if enabled, contin-
ues to operate while in Sleep or Idle modes and resets
the device should VDD fall below the BOR threshold
voltage.
BOR: Brown-Out Reset
DDCORE
. The main purpose of the BOR
© 2007 Microchip Technology Inc.
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