Operating with Programmers
103
such "high voltages".
Powering
1. The target gets power from the ChipProg . This is possible only if
the target does not consume too much energy. The current supplied
from the programmer may not exceed 80 mA, a capacity of the target
power circuitry should not exceed 50 uF.
2. The target gets power from a built-in or external power supply. In
this case the power output from the ChipProg
It is strictly prohibited to power the target from both the programmer and
built-in or external power supply simultaneously.
Electrical
characteristics of the
ChipProg signals
Max current load for the logical signals - 5 mA.
Max current load for the Vcc line - 80 mA.
Max current load for the Vpp line - 80 mA.
NOTE! Always carefully check connecting your ChipProg programmer to the target. Wrong
connecting may, and probably will cause destruction of the programmer's and/or the target
system's hardware.
Most embedded microcontrollers have different algorithms for the ISP procedure. See the following
topics regarding the ISP for popular microcontrollers:
Specifics of the in-system programming of the Microchip PICmicro
Specifics of the in-system programming of the Atmel AVR microcontrollers
Specifics of the in-system programming of the Atmel 8051 microcontrollers
? 2010 Phyton, Inc. Microsystems and Development Tools
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