Computex FP-40 - Dimensions of TARGET Cable; Target Interface Voltage Level; Signal Specifications

Technical Information on On-board Flash Programmer FP-40 Aug. 31, 2023 (Second edition)
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Dimensions of TARGET cable
Dimensions of the dedicated TARGET cable are as follows.
Target interface voltage level
 Input voltage level
Target voltage (V)
5.0V
3.3V
1.8V
VIH(min)
3.5V
2.0V
1.17V
VIL(max)
1.5V
0.8V
0.63V
 Output voltage level
Target voltage (V)
4.5V
3.0V
1.65V
VOH(min)
3.8V
2.4V
1.2V
VOL(max)
0.55V
0.55V
0.45V
Signal specifications
RXD/TXD signals
UART RXD/TXD signals.
Data is transmitted by FP-40 via TXD signal line.
Data is received by FP-40 via RXD signal line.
SRST signal
SRST signal is used as the reset signal for initializing the CPU from FP-40.
The output from FP-40 is open-collector to allow wired-OR connections on the power-on-reset and system reset signals
on the target.
VTref signal
Connect the CPU's I/O power to this signal. The valid range should be 1.65V~5.5V.
FP-40 communicates at a signal level that follows the potential connected to this signal. However, some of FP-40 unique
signals are 3.3V dedicated I/F. For specifications, refer to "External I/O functions of FP-40".