PIC12F609-I/PQTP MICROCHIP [Microchip Technology], PIC12F609-I/PQTP Datasheet - Page 112

• Manufacturer Part Number: PIC12F609-I/PQTP
• Description: 8-Pin Flash-Based, 8-Bit CMOS Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

PIC12F609/615/12HV609/615
11.10 In-Circuit Serial Programming™
The PIC12F609/615/12HV609/615 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 GP0 and GP1 pins low, while raising the
MCLR (V
16F6XX
(DS41204) for more information. GP0 becomes the
programming
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 11-10.
FIGURE 11-10:
DS41302A-page 110
Note:
External
Connector
Signals
* Isolation devices (as required)
Data I/O
CLK
+5V
V
0V
PP
PP
) pin from V
Memory
To erase the device V
the Bulk Erase V
“PIC12F609/615/12HV609/615
Programming Specification” (DS41284)
data
*
To Normal
Connections
To Normal
Connections
TYPICAL IN-CIRCUIT
SERIAL PROGRAMMING
CONNECTION
IL
*
Programming
and
to V
*
*
IHH
DD
GP1
. See the “PIC12F6XX/
minimum given in the
V
V
MCLR/V
GP1
GP0
PIC12F615/12HV615
PIC12F609/12HV609
DD
SS
DD
must be above
becomes
PP
Specification”
/GP3
Memory
Preliminary
the
11.11 In-Circuit Debugger
Since in-circuit debugging requires access to three pins,
MPLAB
not practical. A special 28-pin PIC12F609/615/
12HV609/615 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 PIC12F609/615/12HV609/615
device. The debugging adapter is the only source of the
ICD device.
When the ICD pin on the PIC12F609/615/12HV609/
615 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 11-10 shows which features are consumed
by the background debugger.
TABLE 11-10: DEBUGGER RESOURCES
For more information, see “MPLAB
Debugger User’s Guide” (DS51331), available on
Microchip’s web site (www.microchip.com).
Resource
I/O pins
Stack
Program Memory
®
ICD 2 development with an 14-pin device is
Description
ICDCLK, ICDDATA
1 level
Address 0h must be NOP
700h-7FFh
© 2006 Microchip Technology Inc.
®
ICD 2 In-Circuit