PIC16F648A-E/P Microchip Technology, PIC16F648A-E/P Datasheet - Page 101

• Manufacturer Part Number: PIC16F648A-E/P
• Description: IC MCU FLASH 4KX14 EEPROM 18DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F648A-E/P

• Program Memory Type: FLASH
• Program Memory Size: 7KB (4K x 14)
• Package / Case: 18-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Eeprom Size: 256 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SCI/USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163014, DM164120-4
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: I3DBF648 - BOARD DAUGHTER ICEPIC3AC162053 - HEADER INTERFACE ICD,ICD2 18DIPACICE0202 - ADAPTER MPLABICE 18P 300 MIL
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

14.4.5
On power-up the time out sequence is as follows: First
PWRT time out is invoked after POR has expired. Then
OST is activated. The total time out will vary based on
oscillator configuration and PWRTE bit Status. For
example, in RC mode with PWRTE bit set (PWRT
disabled), there will be no time out at all. Figure 14-8,
Figure 14-9
sequences.
Since the time outs occur from the POR pulse, if MCLR
is kept low long enough, the time outs will expire. Then
bringing MCLR high will begin execution immediately
(see Figure 14-9). This is useful for testing purposes or
to synchronize more than one PIC16F627A/628A/
648A device operating in parallel.
Table 14-6 shows the Reset conditions for some
special registers, while Table 14-7 shows the Reset
conditions for all the registers.
TABLE 14-3:
TABLE 14-4:
 2004 Microchip Technology Inc.
Legend:
Oscillator Configuration
POR
0
0
0
1
1
1
1
1
XT, HS, LP
INTOSC
RC, EC
u = unchanged, x = unknown
TIME OUT SEQUENCE
and
BOR
X
X
X
0
1
1
1
1
TIME OUT IN VARIOUS SITUATIONS
STATUS/PCON BITS AND THEIR SIGNIFICANCE
Figure 14-10
TO
1
0
X
X
0
0
u
1
PWRTEN = 0
1024•T
72 ms +
depict
72 ms
72 ms
PD
1
X
0
X
u
0
u
0
OSC
Power-up
time
Power-on Reset
Illegal, TO is set on POR
Illegal, PD is set on POR
Brown-out Reset
WDT Reset
WDT Wake-up
MCLR Reset during normal operation
MCLR Reset during Sleep
PWRTEN = 1
Preliminary
out
1024•T
—
—
PIC16F627A/628A/648A
OSC
14.4.6
The power control/Status Register, PCON (address
8Eh) has two bits.
Bit 0 is BOR (Brown-out Reset). BOR is unknown on
Power-on-Reset. It must then be set by the user and
checked on subsequent Resets to see if BOR = 0
indicating that a brown-out has occurred. The BOR
Status bit is a don’t care and is not necessarily
predictable if the brown-out circuit is disabled (by
setting BOREN bit = 0 in the Configuration word).
Bit 1 is POR (Power-on Reset). It is a ‘0’ on Power-on
Reset and unaffected otherwise. The user must write a
‘1’ to this bit following a Power-on Reset. On a
subsequent Reset if POR is ‘0’, it will indicate that a
Power-on Reset must have occurred (V
gone too low).
PWRTEN = 0
1024•T
72 ms +
72 ms
72 ms
Brown-out Reset
POWER CONTROL (PCON) STATUS
REGISTER
Condition
OSC
PWRTEN = 1
1024•T
—
—
OSC
DS40044B-page 99
from Sleep
1024•T
DD
Wake-up
6 s
may have
—
OSC