S1C63454 TECHNICAL MANUAL
EPSON
117
APPENDIX S5U1C63000P MANUAL (PERIPHERAL CIRCUIT BOARD FOR S1C63404/454/455/458/466/P466)
(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 S1C63404/454/455/458/466/
P466.
- When the LCD driver is turned OFF in external power supply mode using the LPWR register, the
SEG and COM terminals go to the V
SS
level. In this board with the LCD board, the SEG terminals go
to the V
SS
level and the COM terminals go to the V
C1
level.
<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 S1C63404/454/455/458/466/
P466 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.
<Access to undefined address space>
If any undefined space in the S1C63404/454/455/458/466/P466's internal ROM/RAM or I/O is
accessed for data read or write operations, the read/written value is indeterminate. Additionally, it is
important to remain aware that indeterminate state differs between this board and the actual IC. Note
that the ICE (S5U1C63000H1/S5U1C63000H2) incorporates the program break function caused by
accessing to an undefined address space.
<Reset circuit>
Keep in mind that the operation sequence from when the ICE and this board are powered on until the
time at which the program starts running differs from the sequence from when the actual IC is
powered on till the program starts running. This is because this board becomes capable of operating
as a debugging system after the user program and optional data are downloaded. When operating the
ICE after placing it in free-running mode, always apply a system reset. A system reset can be per-
formed by pressing the reset switch on this board, by a reset pin input, or by holding the input ports
low simultaneously.
<Internal power supply circuit>
- Although this board contains VDC register, it does not actually exercise power supply control by this
register. Be sure to refer to the technical manual for the S1C63404/454/455/458/466/P466 when
setting the correct voltage. Also, when switching the control voltages, consult the technical manual
to determine the appropriate wait time to be inserted.
- Note that the LCD drive voltage on this board may not be identical to that on the actual IC.
- Since the usable operating frequency range depends on the device's internal operating voltage,
consult the technical manual for the S1C63404/454/455/458/466/P466 to ensure that the device will
not be operated with an inappropriate combination of the operating frequency and the internal
power supply.
Содержание S1C63454
Страница 1: ...MF1074 03 Technical Manual CMOS 4 BIT SINGLE CHIP MICROCOMPUTER S1C63454 Technical Hardware S1C63454 ...
Страница 4: ......
Страница 6: ......
Страница 10: ......