dsPIC33F/PIC24H PROGRAMMING SPECIFICATION
In addition to code memory protection, a part of Data
RAM can be configured to be accessible only by code
resident in the Boot Segment and/or Secure Segment.
The sizes of these “reserved” sections are user-config-
urable, using the RBS<1:0> and RSS<1:0> bits.
3.6.5
USER UNIT ID
The dsPIC33F/PIC24H devices provide four 8-bit Con-
figuration registers (FUID0 through FUID3) for the user
to store product-specific information, such as unit serial
numbers and other product manufacturing data.
Note:
All bits in the FBS, FSS and FGS Configu-
ration registers can only be programmed
to a value of ‘0’. the ERASEBcommand is
the only way to reprogram code-protect
bits from ON (‘0’) to OFF (‘1’).
FIGURE 3-5:
CONFIGURATION BIT PROGRAMMING FLOW
Start
ConfigAddress = 0xF80000
Send PROGC
Command
Is
No
PROGCresponse
PASS?
Yes
Is
No
ConfigAddress =
ConfigAddress + 2
ConfigAddress
0xF80018?
Yes
Failure
Report Error
Finish
FIGURE 3-6:
EXITING ENHANCED
ICSP™ MODE
3.7
Exiting Enhanced ICSP Mode
Exiting Program/Verify mode is done by removing VIH
from MCLR, as shown in Figure 3-6. The only require-
ment for exit is that an interval P16 should elapse
between the last clock and program signals on PGC
and PGD before removing VIH.
P16
P17
VIH
MCLR
VDD
VIH
PGD
PGC
PGD = Input
DS70152D-page 46
Preliminary
© 2007 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
