Microchip Technology MCP1630DM-DDBS1 Data Sheet
PIC12F683
DS41211D-page 100
©
2007 Microchip Technology Inc.
12.10 In-Circuit Serial Programming™
The PIC12F683 microcontrollers can be serially
programmed while in the end application circuit. This is
simply done with five connections for:
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.
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 GP0 and GP1 pins low, while raising the
MCLR (V
holding the GP0 and GP1 pins low, while raising the
MCLR (V
PP
) pin from V
IL
to V
IHH
. See the
“PIC12F6XX/16F6XX Memory Programming
Specification” (DS41204) for more information. GP0
becomes the programming data and GP1 becomes the
programming clock. Both GP0 and GP1 are Schmitt
Trigger inputs in Program/Verify mode.
Specification” (DS41204) for more information. GP0
becomes the programming data and GP1 becomes the
programming clock. Both GP0 and GP1 are Schmitt
Trigger inputs in Program/Verify mode.
A typical In-Circuit Serial Programming connection is
shown in Figure 12-11.
shown in Figure 12-11.
FIGURE 12-11:
TYPICAL IN-CIRCUIT
SERIAL PROGRAMMING
CONNECTION
SERIAL PROGRAMMING
CONNECTION
12.11 In-Circuit Debugger
Since in-circuit debugging requires access to three
pins, MPLAB
pins, MPLAB
®
ICD 2 development with a 14-pin device
is not practical. A special 14-pin PIC12F683 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.
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 PIC12F683 device. The
debugging adapter is the only source of the ICD device.
be used in place of a PIC12F683 device. The
debugging adapter is the only source of the ICD device.
When the ICD pin on the PIC12F683 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.
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).
Microchip’s web site (www.microchip.com).
FIGURE 12-12:
14-PIN ICD PINOUT
External
Connector
Signals
Connector
Signals
To Normal
Connections
Connections
To Normal
Connections
Connections
PIC12F683
V
DD
V
SS
MCLR/V
PP
/GP3
GP1
GP0
+5V
0V
V
PP
CLK
Data I/O
*
*
*
*
* Isolation devices (as required)
Resource
Description
Stack
1 level
Program Memory
Address 0h must be
NOP
700h-7FFh
14-Pin PDIP
PIC
1
2F68
3-IC
D
In-Circuit Debug Device
NC
ICDMCLR
V
DD
GP5
GP4
GP3
ICD
ICDCLK
ICDDATA
GND
GP0
GP1
GP2
NC
1
2
3
4
5
6
7
14
13
12
9
11
10
8