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9 Troubleshooting
Appendix
Initial Validation when Designing a Target Board
This section explains the procedure for checking that the S1C processor mounted on the target board is working
properly.
Step 1
Check that the most basic circuits such as the power supply, reset, and debugging pins are working normally.
(1) With the ICDmini switched on but not connected, input High
This resets the S1C processor.
(2) Input a Low signal to the DSIO pin (input pin).
This sets the S1C processor to debug mode.
(3) If DST2 pin (output pin) changes from Low to High, it indicates that the most basic functions of the S1C17
processor are working.
(If the S1C processor is set to the debug mode, the DST2 pin changes from Low to High.)
Strictly speaking, if a Low signal is input continuously, the output from DST2 is as follows.
DST2
If DST2 pin (output pin) does not change from Low to High, check the hardware of the target board.
Step 2
Try to establish a connection with the ICDmini.
(1) Set the DIP switches of the ICDmini.
The default is all open. Set the switches appropriately for the target board.
In this test, make the following settings at the minimum.
SW2 = OPEN
SW3 = OPEN
SW7 = OPEN
SW8 = OPEN
If the S1C17 processor is operating with IO voltage other than 3.3 V, it is necessary to change the settings of
SW4 and SW5.
(2) Connect the ICDmini to a PC installed with the ICDmini USB driver, and connect the debugging pins (DCLK,
DSIO, and DST2) and GND to the ICDmini with the target interface cable provided.
The target is functioning normally if the LEDs on the top of the case are as follows.
LED1
(blue)
l
LED2
(blue)
l
LED3
(out)
l
LED4
(green)
l
Normal.
g
LED1
(blue)
l
LED2
(blue)
l
LED3
(red)
l
LED4
(green)
l
Input High
Low
g
g
This resets the S1C processor.
24
High signals to the #RESET pin.
g
Seiko Epson Corporation
Low
High signals to the #RESET pin.
g
g
S5U1C17001H USER MANUAL
(ICDMINI VER1.0 and VER1.1)
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