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4.2 Programming Cable
The programming cable has a level converter board in the middle of the cable since the
LP3500 programming port supports CMOS logic levels, and not the higher voltage RS-232
levels that are used by PC serial ports. When the programming cable is connected,
Dynamic C running on the PC can hard-reset the LP3500 and cold-boot it. The cold boot
includes compiling and downloading a BIOS program that stays resident while you work. If
you crash the target, Dynamic C will automatically reboot and recompile the BIOS if it
senses that a target communication error occurred or that the BIOS source code has changed.
4.2.1 Switching Between Program Mode and Run Mode
The LP3500 is automatically in Program Mode when the programming cable is attached,
and is automatically in Run Mode when no programming cable is attached. See Figure 19.
C16
C19
RN2
C20
D5
D7
D2
D4
Q22
D8
C10
C13
RN1
R13
R6
R16
R7
R9
D1
R1
AIN0 AIN1 AIN2 AIN3
AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 GND
Colored edge
Figure 19. LP3500 Program Mode and Run Mode Set-Up
4.2.2 Detailed Instructions: Changing from Program Mode to Run Mode
1. Disconnect the programming cable from header J3 of the LP3500.
2. Reset the LP3500 by unplugging the AC adapter, then plugging it back in, or press the RESET
switch.
The LP3500 is now ready to operate in the Run Mode.
4.2.3 Detailed Instructions: Changing from Run Mode to Program Mode
1. Attach the programming cable to header J1 of the LP3500.
2. Reset the LP3500 by unplugging the AC adapter, then plugging it back in, or press the RESET
switch. Alternatively, you may press <Ctrl-Y> on your PC if Dynamic C is running.
The LP3500 is now ready to operate in the Program Mode.
User's Manual
J8
RELAY
U1
D25
C36
Q10
Q16
Q17
R43
D18
D21
K1
R33
C48
Q6
Y2
Q13
D32
Q12
C51
C67
U12
U3
C55 R44
R47
U8
Q14
D33
C22
J6
U11
D13
BT1
R48
U10
R30
U9
RP13
S1
R58
C65
C50 R36 R40 C54
Q20
Y1
C26
C33
RESET
R50
R54
R20 R25
R32
R49
J3
J5
R22
R26
D22
J2
PROGRAM
VBAT
PORT
GND
EXT GND VIN GND
GND
Power
To
PC COM port
RESET LP3500 when changing mode:
Press RESET switch,
Remove, then reapply power
after removing or attaching programming cable.
C16
U1
C36
C19
RN2
D18
C20
C22
D5
D13
BT1
D7
D2
D4
Q22
D8
R30
C10
C13
RN1
R13
R6
R16
R7
R9
C26
C33
D1
R20 R25
J3
R1
R22
R26
AIN0 AIN1 AIN2 AIN3
AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 GND
OR
J8
RELAY
D25
Q16
Q17
Q10
D21
R43
K1
R33
C48
Q6
Q13
D32
Y2
Q12
C51
C67
U12
C55 R44
R47
U3
U8
Q14
D33
J6
U11
R48
U10
U9
RP13
S1
C65
R58
C50 R36 R40 C54
Q20
Y1
RESET
R50
R54
R49
R32
J5
D22
J2
PROGRAM
PORT
GND VBAT
EXT GND VIN GND
GND
Power
switch
37
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