PIC16F684-E/P Microchip Technology, PIC16F684-E/P Datasheet - Page 110

• Manufacturer Part Number: PIC16F684-E/P
• Description: IC PIC MCU FLASH 2KX14 14DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F684-E/P

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 14-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 12
• Eeprom Size: 256 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 12
• 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
• On-chip Adc: 8-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DM163029 - BOARD PICDEM FOR MECHATRONICSACICE0207 - MPLABICE 14P 300 MIL ADAPTER
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC16F684
FIGURE 12-10:
12.8
If
programmed, the on-chip program memory can be
read out using ICSP
12.9
Four memory locations (2000h-2003h) are designated
as ID locations where the user can store checksum or
other code identification numbers. These locations are
not accessible during normal execution but are
readable and writable during Program/Verify mode.
Only the Least Significant 7 bits of the ID locations are
used.
12.10 In-Circuit Serial Programming
The PIC16F684 microcontrollers can be serially
programmed while in the end application circuit. This is
simply done with two lines for clock and data and three
other lines for:
• power
• ground
• programming voltage
DS41202C-page 108
Instruction Flow
(INTCON<1>)
(INTCON<7>)
Note:
INTF flag
GIE bit
Instruction
Fetched
Instruction
Executed
the
CLKOUT
Note 1:
INT pin
OSC1
Code Protection
ID Locations
code
PC
2:
3:
4:
(4)
The entire data EEPROM and Flash
program memory will be erased when the
code protection is turned off. See the
“PIC12F6XX/16F6XX Memory Program-
ming Specification” (DS41204) for more
information.
XT, HS or LP Oscillator mode assumed.
T
GIE = ‘1’ assumed. In this case after wake-up, the processor jumps to 0004h. If GIE = ‘0’, execution will continue in-line.
CLKOUT is not available in XT, HS, LP or EC oscillator modes, but shown here for timing reference.
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1
Inst(PC) = Sleep
OST
protection
Inst(PC – 1)
= 1024 T
PC
™
WAKE-UP FROM SLEEP THROUGH INTERRUPT
for verification purposes.
OSC
(drawing not to scale). This delay does not apply to EC and RC Oscillator modes.
bit(s)
Inst(PC + 1)
Sleep
PC + 1
have
Processor in
not
Sleep
PC + 2
been
Preliminary
T
OST (2)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
Interrupt Latency
Inst(PC + 2)
Inst(PC + 1)
This allows customers to manufacture boards with
unprogrammed devices and then program the micro-
controller just before shipping the product. This also
allows the most recent firmware or a custom firmware
to be programmed.
The device is placed into a Program/Verify mode by
holding the RA0 and RA1 pins low, while raising the
MCLR (V
16F6XX
(DS41204) for more information. RA0 becomes the
programming data and RA1 becomes the programming
clock. Both RA0 and RA1 are Schmitt Trigger inputs in
this mode.
After Reset, to place the device into Program/Verify
mode, the Program Counter (PC) is at location 00h. A
6-bit command is then supplied to the device.
Depending on the command, 14 bits of program data
are then supplied to or from the device, depending on
whether the command was a load or a read. For
complete details of serial programming, please refer to
the
Specification” (DS41204).
A typical In-Circuit Serial Programming connection is
shown in Figure 12-11.
PC + 2
“PIC12F6XX/16F6XX
PP
(3)
Dummy Cycle
) pin from V
Memory
PC + 2
IL
Programming
 2004 Microchip Technology Inc.
to V
Dummy Cycle
Inst(0004h)
0004h
IHH
Memory
. See the “PIC12F6XX/
Inst(0005h)
Inst(0004h)
Programming
Specification”
0005h