PIC16F628A-I/ML Microchip Technology, PIC16F628A-I/ML Datasheet - Page 101

• Manufacturer Part Number: PIC16F628A-I/ML
• Description: IC MCU FLASH 2KX14 EEPROM 28QFN
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F628A-I/ML

• Core Size: 8-Bit
• Program Memory Size: 3.5KB (2K x 14)
• Core Processor: PIC
• Speed: 20MHz
• Connectivity: UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 224 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Controller Family/series: PIC16F
• No. Of I/o's: 16
• Eeprom Memory Size: 128Byte
• Ram Memory Size: 224Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 224 B
• Interface Type: SCI, USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 1 x 16 bit
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 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: AC164324 - MODULE SKT FOR MPLAB 8DFN/16QFNXLT28QFN3 - SOCKET TRAN ICE 18DIP/28QFNI3DBF648 - BOARD DAUGHTER ICEPIC3AC164033 - ADAPTER 28QFN TO 18DIPAC162053 - HEADER INTERFACE ICD,ICD2 18DIPDV007003 - PROGRAMMER UNIVERSAL PROMATE II
• Data Converters: -
• Lead Free Status / Rohs Status: Details

14.2.6
For applications where precise timing is not a
requirement, the RC oscillator option is available. The
operation and functionality of the RC oscillator is
dependent upon a number of variables. The RC oscillator
frequency is a function of:
• Supply voltage
• Resistor (R
• Operating temperature
The oscillator frequency will vary from unit-to-unit due
to normal process parameter variation. The difference
in lead frame capacitance between package types will
also affect the oscillation frequency, especially for low
C
tolerance of the external R and C components.
Figure 14-5 shows how the R/C combination is
connected.
FIGURE 14-5:
The RC Oscillator mode has two options that control
the unused OSC2 pin. The first allows it to be used as
a general purpose I/O port. The other configures the
pin as an output providing the F
clock divided by 4) for test or external synchronization
purposes.
14.2.7
The PIC16F627A/628A/648A can be configured to
provide a clock out signal by programming the
Configuration Word. The oscillator frequency, divided
by 4 can be used for test purposes or to synchronize
other logic.
© 2009 Microchip Technology Inc.
C
Recommended Values: 3 kΩ ≤ R
EXT
R
V
EXT
SS
EXT
F
values. The user also needs to account for the
V
OSC
DD
/4
RC OSCILLATOR
CLKOUT
EXT
CLKIN
RA7/OSC1/
RA6/OSC2/CLKOUT
) and capacitor (C
PIC16F627A/628A/648A
RC OSCILLATOR MODE
10 kΩ ≤ R
C
EXT
> 20 pF
EXT
EXT
≤ 100 kΩ (V
OSC
≤ 100 kΩ (V
EXT
) values
signal (internal
Internal
Clock
DD
DD
≥ 3.0V)
< 3.0V)
PIC16F627A/628A/648A
14.2.8
A software programmable dual-speed oscillator mode
is provided when the PIC16F627A/628A/648A is
configured in the INTOSC oscillator mode. This feature
allows users to dynamically toggle the oscillator speed
between 4 MHz and 48 kHz nominal in the INTOSC
mode. Applications that require low-current power
savings, but cannot tolerate putting the part into Sleep,
may use this mode.
There is a time delay associated with the transition
between fast and slow oscillator speeds. This oscillator
speed transition delay consists of two existing clock
pulses and eight new speed clock pulses. During this
clock speed transition delay, the System Clock is halted
causing the processor to be frozen in time. During this
delay, the program counter and the CLKOUT stop.
The OSCF bit in the PCON register is used to control
Dual Speed mode. See Section 4.2.2.6 “PCON
Register”, Register 4-6.
14.3
The PIC16F627A/628A/648A 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, Brown-out Reset, MCLR
Reset, WDT Reset and MCLR Reset during Sleep.
They 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 Table 14-4. These bits are
used in software to determine the nature of the Reset.
See Table 14-7 for a full description of Reset states of
all registers.
A simplified block diagram of the on-chip Reset circuit
is shown in Figure 14-6.
The MCLR Reset path has a noise filter to detect and
ignore small pulses. See Table 17-7 for pulse width
specification.
Power-on Reset (POR)
MCLR Reset during normal operation
MCLR Reset during Sleep
WDT Reset (normal operation)
WDT wake-up (Sleep)
Brown-out Reset (BOR)
Reset
SPECIAL FEATURE: DUAL-SPEED
OSCILLATOR MODES
DS40044G-page 101