PIC16F737-I Datasheet, PDF (194/276 Pages) Microchip Technology – 28/40/44-Pin, 8-Bit CMOS Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC16F7X7
15.19 In-Circuit Debugger
When the DEBUG bit in the Configuration Word is pro-
grammed to a ‘0’, the In-Circuit Debugger functionality
is enabled. This function allows simple debugging
functions when used with MPLAB^® ICD. When the
microcontroller has this feature enabled, some of the
resources are not available for general use. Table 15-7
shows which features are consumed by the background
debugger.
TABLE 15-7: DEBUGGER RESOURCES
I/O pins
RB6, RB7
Stack
1 level
Program Memory
Address 0000h must be NOP
Last 100h words
Data Memory
0x070 (0x0F0, 0x170, 0x1F0)
0x165-0x16F
To use the In-Circuit Debugger function of the micro-
controller, the design must implement In-Circuit Serial
Programming connections to MCLR/VPP, VDD, GND,
RB7 and RB6. This will interface to the In-Circuit
Debugger module available from Microchip or one of
the third party development tool companies.
Note:
In-Circuit Debugger operation must occur
between the operating voltage range
(VDD) of 4.75V-5.25V on PIC16F7X7
devices.
15.20 Program Verification/Code
Protection
If the code protection bit(s) have not been
programmed, the on-chip program memory can be
read out for verification purposes.
15.21 ID Locations
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. It is
recommended that only the four Least Significant bits
of the ID location are used.
15.22 In-Circuit Serial Programming
PIC16F7X7 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 and the programming
voltage (see Figure 15-17 for an example). This allows
customers to manufacture boards with unprogrammed
devices and then program the microcontroller just
before shipping the product. This also allows the most
recent firmware or a custom firmware to be
programmed.
For general information of serial programming, please
refer to the “In-Circuit Serial Programming™ (ICSP™)
Guide” (DS30277).
FIGURE 15-17:
TYPICAL IN-CIRCUIT
SERIAL PROGRAMMING™
CONNECTION
External
Connector
Signals
To Normal
Connections
*
PIC16F7X7
+5V
0V
VPP
CLK
Data I/O
VDD
VSS
MCLR/VPP/RE3
RB6
RB7
***
VDD
To Normal
Connections
* Isolation devices (as required).
DS30498C-page 192
 2004 Microchip Technology Inc.