PIC16F721T-I/SS Microchip Technology, PIC16F721T-I/SS Datasheet - Page 27

• Manufacturer Part Number: PIC16F721T-I/SS
• Description: 7 KB FLASH, 256 B SRAM, 18 I/O 20 SSOP .209in T/R
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F721T-I/SS

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.0
The PIC16F/LF720/721 differentiates between various
kinds of Reset:
a)
b)
c)
d)
e)
f)
Some registers are not affected in any Reset condition;
their status is unknown on POR and unchanged in any
other Reset. Most other registers are reset to a “Reset
state” on:
• Power-on Reset (POR)
• MCLR Reset
• MCLR Reset during Sleep
• WDT Reset
• Brown-out Reset (BOR)
FIGURE 3-1:
 2010 Microchip Technology Inc.
Power-on Reset (POR)
WDT Reset during normal operation
WDT Reset during Sleep
MCLR Reset during normal operation
MCLR Reset during Sleep
Brown-out Reset (BOR)
RESETS
MCLR/V
OSC1/
CLKIN
Note 1:
V
DD
PP
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
WDTOSC
OST/PWRT
Refer to the Configuration Word Register 1
Brown-out
Module
WDT
Reset
POR
MCLRE
OST
PWRT
(1)
10-bit Ripple Counter
WDT
Time-out
Reset
11-bit Ripple Counter
BOREN
Power-on Reset
Sleep
(Register
Most registers are not affected by a WDT wake-up
since this is viewed as the resumption of normal
operation. TO and PD bits are set or cleared differently
in different Reset situations, as indicated in
These bits are used in software to determine the nature
of the Reset.
A simplified block diagram of the On-Chip Reset Circuit
is shown in
The MCLR Reset path has a noise filter to detect and
ignore small pulses. See
Specifications”
8-1).
PIC16F/LF720/721
Figure
for pulse width specifications.
3-1.
Enable PWRT
Enable OST
Section 23.0 “Electrical
DS41430A-page 27
Chip_Reset
Table
3-5.