Interface Specifications - NEC Flash Memory Programmer PG-FP3 User Manual

7.4.1 Interface Specifications

Use the target interface connector to interface with the target.
Bear in mind the following points when connecting the target and designing the target board.
Supply voltage and operating clock of target
Basically, supply the power and operating clock to the microcontroller from the target board when programming
its flash memory. Power can be also supplied from the PG-FP3, but a current high enough to operate the
entire target cannot be supplied. In addition, the frequency of the clock that can be supplied from the PG-FP3
is limited to 16, 8, 4, and 2 MHz.
When supplying power and a clock from the PG-FP3, use a dedicated writing adapter such as the FA adapter
The level of each interface signal is converted in the PG-FP3 at the operating voltage (V
when the power supply (V
two supply voltages and requiring interface signals of different levels, output either of the voltage levels from the
PG-FP3, and convert the level of the signal with the different signal level on the target.
Signal conflict
If an output from another device is connected to the serial interface pin and reset pin, a signal conflict or
malfunction may occur. If this occurs, either isolate the connection with the other device, or make the output
from the other device high impedance. Exercise care so that the target is not inadvertently reset during
programming.
Connection of serial port
When programming flash memory using a UART or SIO, match the input/output of the SI and SO signals when
connecting the SI (RxD) and SO (TxD) signals of the PG-FP3 to the SI (RxD) and SO (TxD) of the target.
When interfacing with IIC, the SI pin of the PG-FP3 serves as a SD (serial data) line. Therefore, connect the
SCK and SI pin.
Note The FA adapter is a product of Naito Densei Machida Mfg. Co., Ltd.
CHAPTER 7 HARDWARE SPECIFICATIONS
) on the user target is used, connect the V
DD
PG-FP3 side
SI (RxD)
SO (TxD)
User's Manual U13502EJ2V0UM00
line to the target. With a device using
DD
Microcontroller side
SO (TxD)
SI (RxD)
Note
.
). Therefore, even
DD
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