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PIC16F684-E/ST Datasheet(PDF) 111 Page - Microchip Technology

Part # PIC16F684-E/ST
Description  14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
PDF  164 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F684-E/ST Datasheet(HTML) 111 Page - Microchip Technology

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 2004 Microchip Technology Inc.
Preliminary
DS41202C-page 109
PIC16F684
FIGURE 12-11:
TYPICAL IN-CIRCUIT
SERIAL PROGRAMMING
CONNECTION
12.11 In-Circuit Debugger
Since in-circuit debugging requires access to the data
and MCLR pins, MPLAB® ICD 2 development with an
14-pin device 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:
DEBUGGER RESOURCES
For more information, see “MPLAB® ICD 2 In-Circuit
Debugger User’s Guide” (DS51331), available on
Microchip’s web site (www.microchip.com).
FIGURE 12-12:
20-PIN ICD PINOUT
External
Connector
Signals
To Normal
Connections
To Normal
Connections
PIC16F684
VDD
VSS
MCLR/VPP/RA3
RA1
RA0
+5V
0V
VPP
CLK
Data I/O
*
*
*
*
* Isolation devices (as required)
Resource
Description
I/O pins
ICDCLK, ICDDATA
Stack
1 level
Program Memory
Address 0h must be NOP
700h-7FFh
20-Pin PDIP
In-Circuit Debug Device
NC
ICDMCLR/VPP
VDD
RA5
RA4
RA3
ICDCLK
ICDDATA
Vss
RA0
ICD
NC
RA1
RA2
RC5
RC4
RC3
RC0
RC1
RC2
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11



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