PIC16F526-E/MG Microchip Technology, PIC16F526-E/MG Datasheet - Page 55

• Manufacturer Part Number: PIC16F526-E/MG
• Description: 1.5KB Flash Program, 64B Flash Data, 8MHz Internal Oscillator, 8b ADC, 2x Compar
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F526-E/MG

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: POR, WDT
• Number Of I /o: 11
• Program Memory Size: 1.5KB (1K x 12)
• Program Memory Type: FLASH
• Ram Size: 67 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 3x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.7
The TO, PD and RBWUF bits in the STATUS register
can be tested to determine if a Reset condition has
been caused by a power-up condition, a MCLR or
Watchdog Timer (WDT) Reset.
TABLE 8-7:
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 PIC16F526 devices when a brown-out occurs,
external brown-out protection circuits may be built, as
shown in Figure 8-12 and Figure 8-13.
 2010 Microchip Technology Inc.
Legend: u = unchanged
CWUF RBWUF TO PD
Note 1: The TO, PD and RBWUF bits maintain
0
0
0
0
0
0
1
Time-out Sequence, Power-down
and Wake-up from Sleep Status
Bits (TO, PD, RBWUF, CWUF)
Reset on Brown-out
their status (u) until a Reset occurs. A
low-pulse on the MCLR input does not
change the TO, PD and RBWUF Status
bits.
0
0
0
0
0
1
0
TO/PD/RBWUF/CWUF
STATUS AFTER RESET
0
0
1
1
u
1
1
0
u
0
1
u
0
0
WDT wake-up from
Sleep
WDT time-out (not from
Sleep)
MCLR wake-up from
Sleep
Power-up
MCLR not during Sleep
Wake-up from Sleep on
pin change
Wake up from Sleep on
comparator change
Reset Caused By
DD
)
FIGURE 8-12:
FIGURE 8-13:
FIGURE 8-14:
Note 1:
Note 1:
Note:
33k
V
2:
2:
SS
V
MCP809
RST
DD
R1
R2
This circuit will activate Reset when V
below Vz + 0.7V (where Vz = Zener voltage).
Pin must be configured as MCLR.
This brown-out circuit is less expensive,
although less accurate. Transistor Q1 turns
off when V
that:
Pin must be configured as MCLR.
This brown-out protection circuit employs
Microchip Technology’s MCP809 microcon-
troller supervisor. There are 7 different trip
point selections to accommodate 5V to 3V
systems.
V
DD
V
10k
V
V
DD
DD
DD
Capacitor
•
Bypass
DD
BROWN-OUT
PROTECTION CIRCUIT 1
BROWN-OUT
PROTECTION CIRCUIT 2
BROWN-OUT
PROTECTION CIRCUIT 3
R1 + R2
Q1
is below a certain level such
40k
PIC16F526
R1
MCLR
(1)
V
Q1
40k
DD
V
DD
MCLR
(1)
(2)
= 0.7V
V
PIC12F510
PIC16F506
PIC12F510
PIC16F506
DD
DS41326E-page 55
(2)
PIC12F510
PIC16F506
MCLR
DD
goes