PIC16F84-10I/P Microchip Technology, PIC16F84-10I/P Datasheet - Page 47

• Manufacturer Part Number: PIC16F84-10I/P
• Description: IC MCU FLASH 1KX14 EE 18DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F84-10I/P

• Core Size: 8-Bit
• Program Memory Size: 1.75KB (1K x 14)
• Core Processor: PIC
• Speed: 10MHz
• Peripherals: POR, WDT
• Number Of I /o: 13
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 68 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 18-DIP (0.300", 7.62mm)
• Controller Family/series: PIC16F
• No. Of I/o's: 13
• Eeprom Memory Size: 64Byte
• Ram Memory Size: 68Byte
• Cpu Speed: 10MHz
• No. Of Timers: 1
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 68 B
• Maximum Clock Frequency: 10 MHz
• Number Of Programmable I/os: 13
• Number Of Timers: 1
• Operating Supply Voltage: 2 V to 6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 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
• For Use With: DVA16XP180 - ADAPTER DEVICE FOR MPLAB-ICEAC164010 - MODULE SKT PROMATEII DIP/SOIC
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Details

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
)