PIC16F684-I/SL Microchip Technology Inc., PIC16F684-I/SL Datasheet - Page 116
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PIC16F684-I/SL
Manufacturer Part Number
PIC16F684-I/SL
Description
14 PIN, 3.5 KB FLASH, 128 RAM, 12 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F684-ISL.pdf
(192 pages)
Specifications of PIC16F684-I/SL
A/d Inputs
8-Channel, 10-Bit
Comparators
2
Cpu Speed
5 MIPS
Eeprom Memory
256 Bytes
Input Output
12
Memory Type
Flash
Number Of Bits
8
Package Type
14-pin SOIC-N
Programmable Memory
3.5K Bytes
Ram Size
128 Bytes
Speed
20 MHz
Timers
2-8-bit, 1-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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PIC16F684
12.10 In-Circuit Serial Programming
The PIC16F684 microcontrollers can be serially
programmed while in the end application circuit. This is
simply done with five connections for:
• clock
• data
• power
• ground
• programming voltage
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
“PIC12F6XX/16F6XX
Specification” (DS41204) for more information. RA0
becomes the programming data and RA1 becomes the
programming clock. Both RA0 and RA1 are Schmitt
Trigger inputs in Program/Verify mode.
A typical In-Circuit Serial Programming connection is
shown in Figure 12-11.
FIGURE 12-11:
DS41202D-page 114
External
Connector
Signals
* Isolation devices (as required)
Data I/O
CLK
+5V
V
0V
PP
PP
) pin from V
*
To Normal
Connections
To Normal
Connections
TYPICAL IN-CIRCUIT
SERIAL PROGRAMMING
CONNECTION
*
*
Memory
*
IL
to V
V
V
MCLR/V
RA1
RA0
DD
SS
IHH
PIC16F684
Programming
. See the
PP
/RA3
12.11 In-Circuit Debugger
Since in-circuit debugging requires access to three
pins, MPLAB
is not practical. A special 20-pin PIC16F684 ICD device
is used with MPLAB ICD 2 to provide separate clock,
data and MCLR pins and frees all normally available
pins to the user.
A special debugging adapter allows the ICD device to
be used in place of a PIC16F684 device. The
debugging adapter is the only source of the ICD device.
When the ICD pin on the PIC16F684 ICD device is held
low, the In-Circuit Debugger functionality is enabled.
This function allows simple debugging functions when
used with MPLAB ICD 2. When the microcontroller has
this feature enabled, some of the resources are not
available for general use. Table 12-9 shows which
features are consumed by the background debugger.
TABLE 12-9:
For more information, see “MPLAB
Debugger User’s Guide” (DS51331), available on
Microchip’s web site (www.microchip.com).
FIGURE 12-12:
Resource
I/O pins
Stack
Program Memory
20-Pin PDIP
ICDMCLR/V
®
ICD 2 development with a 14-pin device
In-Circuit Debug Device
RA5
RA4
RA3
RC5
RC4
RC3
V
ICD
NC
DD
PP
DEBUGGER RESOURCES
Description
ICDCLK, ICDDATA
1 level
Address 0h must be NOP
700h-7FFh
20-PIN ICD PINOUT
© 2006 Microchip Technology Inc.
10
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
®
RC0
RC1
ICDCLK
ICDDATA
Vss
RA0
RA1
RA2
RC2
NC
ICD 2 In-Circuit