Technical Information on On-board Flash Programmer FP-40 Aug. 31, 2023 (Second edition)
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Common specifications for each interface
This is a specification of functions that can be used commonly in each interface.
■ External I/O functions of FP-40
The following signals are provided to allow FP-40 to be operated by an external controller. For information about the
Target connector, refer to section "Specifications of the target connector”.
External input / output function powered by VTref (1 pin)
This function is available only for SWD interface. It is not available for other interfaces.
*1
Outputs high from FP-40 during writing
*1
If the write result is NG, high is output from FP-40.
*2
Start writing when there is a pulse input to FP-40
When the write result is OK, H is output from FP
*1：Hi level will be the same as the VTref (Pin 1 of the target connector) level. Level will be L if VTref is cut off.
*2：Reference voltage needs to be input to VTref in order to detect the pulse.
Note that this function is available only in standalone mode.
The drive capability of the EX_OK, EX_NG, and EX_BSY pins is as follows for both IOL/IOH.
External input / output function using 3.3V I/F
This is provided because when power is supplied to the target system via FP-40, the VTref signal (target voltage) cannot
be used as a reference power supply because power is turned on and off in synchronization with the FP-40 writing
process.
Note that even when the FP-40 power supply function is not used, it can be used as a normal 3.3V external input/output
signal.
However, the external I/O function powered by VTref (Pin 1) above and the 3.3V I/F external I/O function cannot be used
together.
Outputs high from FP-40 during writing
（
）
When the write result is OK, H is output from FP-40
（
）
*1
Start writing when there is a pulse input to FP-40
（
）
*1：Note that this function is available only in standalone mode.
The drive capacity of EX33_BSY and EX33_OK is as follows.
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