PIC16LF84AT-04/SO Microchip Technology, PIC16LF84AT-04/SO Datasheet - Page 47
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PIC16LF84AT-04/SO
Manufacturer Part Number
PIC16LF84AT-04/SO
Description
IC MCU FLASH 1KX14 EE 18SOIC
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F84A-04P.pdf
(88 pages)
2.PIC16F84A-04P.pdf
(6 pages)
3.PIC16LF84A-04P.pdf
(125 pages)
4.PIC16LF84A-04P.pdf
(4 pages)
Specifications of PIC16LF84AT-04/SO
Core Processor
PIC
Core Size
8-Bit
Speed
4MHz
Peripherals
POR, WDT
Number Of I /o
13
Program Memory Size
1.75KB (1K x 14)
Program Memory Type
FLASH
Eeprom Size
64 x 8
Ram Size
68 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
18-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Connectivity
-
8.7
On power-up (Figure 8-10, Figure 8-11, Figure 8-12
and Figure 8-13) the time-out sequence is as follows:
First PWRT time-out is invoked after a POR has
expired. Then the OST is activated. The total time-out
will vary based on oscillator configuration and PWRTE
configuration bit status. For example, in RC mode with
the PWRT disabled, there will be no time-out at all.
TABLE 8-5
Since the time-outs occur from the POR reset pulse, if
MCLR is kept low long enough, the time-outs will
expire. Then bringing MCLR high, execution will begin
immediately (Figure 8-10). This is useful for testing
purposes or to synchronize more than one PIC16F8X
device when operating in parallel.
Table 8-6 shows the significance of the TO and PD bits.
Table 8-3 lists the reset conditions for some special
registers, while Table 8-4 lists the reset conditions for
all the registers.
TABLE 8-6
TO
Configuration
1998 Microchip Technology Inc.
1
0
x
0
0
1
1
XT, HS, LP
Oscillator
RC
PD
1
x
0
1
0
1
0
Time-out Sequence and Power-down
Status Bits (TO/PD)
Power-on Reset
Illegal, TO is set on POR
Illegal, PD is set on POR
WDT Reset (during normal operation)
WDT Wake-up
MCLR Reset during normal operation
MCLR Reset during SLEEP or interrupt
wake-up from SLEEP
1024T
TIME-OUT IN VARIOUS
SITUATIONS
STATUS BITS AND THEIR
SIGNIFICANCE
Enabled
72 ms +
PWRT
72 ms
OSC
Power-up
Condition
1024T
Disabled
PWRT
—
OSC
1024T
Wake-up
SLEEP
from
—
OSC
8.8
A brown-out is a condition where device power (V
dips below its minimum value, but not to zero, and then
recovers. The device should be reset in the event of a
brown-out.
To reset a PIC16F8X device when a brown-out occurs,
external brown-out protection circuits may be built, as
shown in Figure 8-14 and Figure 8-15.
FIGURE 8-14: BROWN-OUT PROTECTION
FIGURE 8-15: BROWN-OUT PROTECTION
This brown-out circuit is less expensive, although less
accurate. Transistor Q1 turns off when V
certain level such that:
This circuit will activate reset when V
(Vz + 0.7V) where Vz = Zener voltage.
Reset on Brown-Out
33k
R1
R2
V
V
DD
DD
V
CIRCUIT 1
CIRCUIT 2
DD
10k
•
R1 + R2
Q1
PIC16F8X
40k
40k
R1
MCLR
MCLR
V
V
DD
PIC16F8X
PIC16F8X
DS30430C-page 47
DD
DD
= 0.7V
goes below
DD
is below a
DD
)