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EPSON
S1C63454 TECHNICAL MANUAL
APPENDIX S5U1C63000P MANUAL (PERIPHERAL CIRCUIT BOARD FOR S1C63404/454/455/458/466/P466)
<SVD circuit>
∗
1
When this tool is used for the S1C63404/458/466/P466:
- Although the S1C63404/458/466/P466 has a function for detecting externally sourced voltages, this
board is unable to detect externally sourced voltages. The SVD function is realized by artificially
varying the power supply voltage using the VSVD control on this board.
- There is a finite delay time from when the power to the SVD circuit turns on until actual detection of
the voltage. On this board, this delay is set to 61–92
µ
sec, which differs from that of the actual IC.
Refer to the technical manual for the S1C63404/458/466/P466 when setting the appropriate wait
time for the actual IC.
<I/O port input circuit>
∗
2
When this tool is used for the S1C63454/455:
This board does not support Schmitt trigger input for the I/O port that is available by mask option
in the actual IC. If the target system needs Schmitt trigger input ports, it should be configured with
an external circuit.
<LCD drive circuit>
∗
3
When this tool is used for the S1C63455:
- Be sure to set the LDUTY0 and LDUTY1 bits (FF60H•D2, D3) as LDUTY0 = 0 and LDUTY1 = 1 or
LDUTY0 = 1 and LDUTY1 = 1, and maintain this status during debugging. This board is configured
as a 1/17 duty LCD driver after an initial reset.
- Do not change the value of the LPAGE bit (FF61H•D0) initialized to 0 as rewriting cause a malfunc-
tion.
∗
1: Applied when this board is used for the S1C63404/458/466/P466
∗
2: Applied when this board is used for the S1C63454/455
∗
3: Applied when this board is used for the S1C63455