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APPENDIX S5U1C63000P MANUAL (PERIPHERAL CIRCUIT BOARD FOR S1C63158/358/P366)
(3) Functional precautions
<LCD power supply circuit>
There is a finite delay time from the point at which the LCD power supply circuit (LPWR) turns on
until an LCD drive waveform is output. On this board, this delay is set to approx. 125 msec, which
differs from that of the actual IC. Refer to the technical manual for the S1C63158/358/P366.
<Differences in LCD drive waveform>
If the LCD is set for static output (STCD register = "1"), the LCD drive waveform on this board and
that of the actual IC will differ in the following respects (for 1/3 bias only).
Register
<Actual IC>
V
C3
SEG
V
C2
V
terminal
C1
V
SS
V
C3
COM
V
C2
V
terminal
C1
V
SS
<S5U1C63000P + LCD board>
V
C3
SEG
V
C2
V
terminal
C1
V
SS
V
C3
COM
V
C2
V
terminal
C1
V
SS
<SVD circuit>
- Although the S1C63158/358/P366 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 µsec, which differs from that of the actual IC.
Refer to the technical manual for the S1C63158/358/P366 when setting the appropriate wait time for
the actual IC.
<Oscillation circuit>
- A wait time is required before oscillation stabilizes after the OSC3 oscillation control circuit (OSCC)
is turned on. On this board, even when OSC3 oscillation is changed (CLKCHG) without a wait time,
OSC3 will function normally. Refer to the technical manual for the S1C63158/358/P366 when setting
the appropriate wait time for the actual IC.
- Use separate instructions to switch the clock from OSC3 to OSC1 and to turn off the OSC3 oscillation
circuit. If executed simultaneously with a single instruction, these operations, although good with
this board, may not function properly well with the actual IC.
- Because the logic level of the oscillation circuit is high, the timing at which the oscillation starts on
this board differs from that of the actual IC.
- This board contains oscillation circuits for OSC1 and OSC3. Keep in mind that even though the
actual IC may not have a resonator connected to its OSC3, its emulator can operate with the OSC3
circuit.
- Do not turn on the OSC3 oscillation circuit when the voltage-regulating circuit for high-speed
operation remains idle.
S1C63358 TECHNICAL MANUAL
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