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PIC24FJ64GA 데이터시트(PDF) 28 Page - Microchip Technology

부품명 PIC24FJ64GA
상세설명  PIC24FJXXXGA0XX Flash Programming Specification
PDF  52 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC24FJ64GA 데이터시트(HTML) 28 Page - Microchip Technology

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PIC24FJXXXGA0XX
DS39768D-page 28
© 2008 Microchip Technology Inc.
FIGURE 4-2:
CONFIRMING PRESENCE
OF PROGRAMMING
EXECUTIVE
4.3
Entering Enhanced ICSP Mode
As shown in Figure 4-3, entering Enhanced ICSP
Program/Verify mode requires three steps:
1.
The MCLR pin is briefly driven high, then low.
2.
A 32-bit key sequence is clocked into PGDx.
3.
MCLR is then driven high within a specified
period of time and held.
The programming voltage applied to MCLR is VIH,
which
is
essentially
VDD
in
the
case
of
PIC24FJXXXGA0XX devices. There is no minimum
time requirement for holding at VIH. After VIH is
removed, an interval of at least P18 must elapse before
presenting the key sequence on PGDx.
The key sequence is a specific 32-bit pattern:
‘0100 1101 0100 0011 0100 1000 0101 0000’
(more easily remembered as 4D434850h in hexa-
decimal format). The device will enter Program/Verify
mode only if the key sequence is valid. The Most
Significant bit (MSb) of the most significant nibble must
be shifted in first.
Once the key sequence is complete, VIH must be
applied to MCLR and held at that level for as long as
Program/Verify mode is to be maintained. An interval of
at least time P19 and P7 must elapse before presenting
data on PGDx. Signals appearing on PGDx before P7
has elapsed will not be interpreted as valid.
On successful entry, the program memory can be
accessed and programmed in serial fashion. While in
the Program/Verify mode, all unused I/Os are placed in
the high-impedance state.
FIGURE 4-3:
ENTERING ENHANCED ICSP™ MODE
Is
Start
Enter ICSP™ Mode
Application ID
BBh?
Resident in Memory
Yes
No
Prog. Executive is
Application ID
Read the
be Programmed
Prog. Executive must
from Address
807F0h
Finish
MCLR
PGDx
PGCx
VDD
P6
P14
b31
b30
b29
b28
b27
b2
b1
b0
b3
...
Program/Verify Entry Code = 4D434850h
P1A
P1B
P18
P19
01
00
1
0
0
0
0
P7
VIH
VIH



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