PIC16F74-I/P Microchip Technology, PIC16F74-I/P Datasheet - Page 56

• Manufacturer Part Number: PIC16F74-I/P
• Description: IC MCU FLASH 4KX14 A/D 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F74-I/P

• Core Size: 8-Bit
• Program Memory Size: 7KB (4K x 14)
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Core Processor: PIC
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Number Of I /o: 33
• Program Memory Type: FLASH
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Controller Family/series: PIC16F
• No. Of I/o's: 33
• Ram Memory Size: 192Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Package: 40PDIP
• Device Core: PIC
• Family Name: PIC16
• Maximum Speed: 20 MHz
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 33
• Interface Type: I2C/SPI/USART
• On-chip Adc: 8-chx8-bit
• Number Of Timers: 3
• Processor Series: PIC16F
• Core: PIC
• Data Ram Size: 192 B
• Maximum Clock Frequency: 20 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: ICE2000, DM163022
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 444-1001 - DEMO BOARD FOR PICMICRO MCU
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

PICmicro MID-RANGE MCU FAMILY
3.2.4
DS31003A-page 3-6
INTERNAL RESET
PWRT TIME-OUT
INTERNAL POR
OST TIME-OUT
Power-up Sequence
MCLR
V
DD
Note 1: Devices with the Internal/External RC option have a nominal 250 s delay.
On power-up, the time-out sequence is as follows: First the internal POR is detected, then, if
enabled, the PWRT time-out is invoked. After the PWRT time-out is over, the OST is activated.
The total time-out will vary based on oscillator configuration and PWRTE bit status. For example,
in RC mode with the PWRTE bit set (PWRT disabled), there will be no time-out at all.
Figure 3-6
Since the time-outs occur from the internal POR pulse, if MCLR is kept low long enough, the
time-outs will expire. Then bringing MCLR high will begin execution immediately
This is useful for testing purposes or to synchronize more than one device operating in parallel.
If the device voltage is not within the electrical specifications by the end of a time-out, the
MCLR/V
external RC delay is sufficient for many of these applications.
Table 3-1
Figure 3-8
Table 3-1:
Figure 3-5: Time-out Sequence on Power-up (MCLR Tied to V
Configuration
XT, HS, LP
Oscillator
RC
PP
shows the time-outs that occur in various situations, while
and
show four different cases that can happen on powering up the device.
pin must be held low until the voltage is within the device specification. The use of an
Time-out in Various Situations
Figure 3-7
72 ms + 1024T
Enabled
72 ms
depict time-out sequences.
Power-up Timer
T
PWRT
OSC
1024T
Disabled
T
OST
—
(1)
OSC
72 ms + 1024T
Brown-out Reset
72 ms
DD
1997 Microchip Technology Inc.
)
OSC
Figure 3-5
(Figure
1024T
Wake-up
Figure
SLEEP
from
—
through
(1)
OSC
3-7).
3-5,