E1/E20/E2/E2 Lite Additional Document 3. Notes on Usage
R20UT2937EJ0301 Rev.3.01 Page 42 of 45
Jul 1, 2020
3.9.5 Software Break Functions
The RL78-S1 core device does not have the software break function. The hardware break function can
be used alternatively but a break will occur several instructions after the breakpoint because the
hardware break function generates a break after execution of the instruction at the breakpoint. Note that
if a branch occurs between the breakpoint and the point where program execution stops, the break
appears to have not occurred at the breakpoint in some cases.
3.9.6 Extended Functions of the E2
3.9.6.1 Solution for the Tuning of Current Consumption
For notes on the solution for the tuning of current consumption, refer to the application note.
3.9.6.2 External Trigger Input and Output
• Use the value of the high-level voltage which can be input to the external trigger input in accordance
with the value that has been set for the power-supply voltage of the E2 expansion interface.
• The value of the high-level voltage which is output on the external trigger outputs depends on the
value that has been set for the power-supply voltage of the E2 expansion interface.
• When a break is detected and a low or high pulse is output with the external trigger output function,
output of the pulse lags behind stopping of the program by a time between over a hundred
microseconds and hundreds of milliseconds.
The time lag is up to 80 ms when the operating frequency is 1.25 MHz.
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