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QuickWriter MCU Programmer
21
Avoid or isolate any other circuitry that touches the MCLR line.
Ideally, use RB6 (clock), RB7(data) and RB3 (LVP/PGM pin, RB4 or RB5 on some PICmicros)
as OUTPUTs in your circuit design OR connect them to outside-world connections or NO
switches so that nothing is driving them during programming. This avoids any need for
isolation. If that is not desirable, design to isolate or tri-state anything that drives these
lines.
Always connect the ground pin.
Decide who powers the target and address the trade-offs involved. (see: ICP with Self
Powered Targets 21 )
When programming, enable the PICmicro MCU's power-up timer Fuse Option if possible.
Particularly if setting the device for internal MCLR or internal OSC.
In-Circuit Programming Cable Pinout
PIN Number | Signal Name | KEY
---------------------------------------------
1. VPP (MCLR) RED
2. VDD (+5) White
3. GND ( - ) White
4. RB7 (data) White
5. RB6 (clock) White
6. NC Pin Block
7. LVP (RB3/RB4/RB5) ** White
** Only necessary for some FLASH devices.
Holds LVP/PGM low to disable Low Voltage Programming.
(connect to RB3 on 16F87X devices, RB4 on PIC16F62X and
RB5 on 18 series MCUs if needed).
Shortcuts
None
2.4.2
ICP with Self Powered Targets
Overview
QuickWriter can supply up to 100 ma of current on the VDD signal (5 volts) when programming
MCUs in-circuit. This includes the current required by the MCU during programming (20 to 50
ma).
When programming MCUs in-circuit, it is sometimes desirable or even necessary for the circuit to
supply its own power. If the target circuit has larger current requirements or if it is not feasible to
power the circuit from the 5 volt power trace (i.e. when this will apply 5 volts to the output of a
voltage regulator), then you should choose QuickWriter's "Monitor a Self Powered Target" option.
? 2007 TechTools
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