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參數(shù)資料
| 型號(hào)： | S1C88409D |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.8 MHz, MICROCONTROLLER, UUC108 |
| 封裝： | DIE-108 |
| 文件頁(yè)數(shù)： | 122/250頁(yè) |
| 文件大?。?/td> | 1877K |
| 代理商： | S1C88409D |
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198
EPSON
S1C88409 TECHNICAL MANUAL
CHAPTER 6: SUMMARY OF NOTES
To switch from 2.4 (4.2) V to 4.2 (2.4) V:
2.4 V
→ 3.2 V → 4.2 V
2.4 V
← 3.2 V ← 4.2 V
A 5 msec interval is required for each switching
steps.
(3) To generate VD1 with specified voltage, the
supply voltage must be higher than the
specified voltage.
To prevent malfunction, make sure that the
supply voltage is not lowered under the VD1
value to be set using the SVD circuit before
switching VD1. Do not switch VD1 to a voltage
higher than the supply voltage if the supply
voltage drops.
(4) The OSC3 oscillation circuit takes a maximum
20 msec for stabilizing oscillation after turning
the OSC3 oscillation circuit on. Therefore, take
an enough interval after the OSC3 oscillation
goes on before starting control of the periph-
eral circuit, such as the programmable timer,
serial interface and A/D converter, that uses
the OSC3 oscillation circuit as the clock source.
(The oscillation start time varies depending on
the oscillator and external component to be
used. Refer to Chapter 8, "ELECTRICAL
CHARACTERISTICS", in which an example of
oscillation start time is indicated.)
(5) Use a separate instruction for switching the
clock from OSC3 to OSC1 and turning the
OSC3 oscillation off. Handling with one
instruction may cause malfunction of the CPU.
(6) To prevent malfunction, before stopping the
OSC3 oscillation, stop the operation of the
peripheral circuits that use the OSC3 oscillation
circuit as the clock source, such as program-
mable timer, serial interface and A/D con-
verter.
(7) Do not turn the OSC3 oscillation circuit on to
reduce current consumption when the OSC3
clock is not necessary.
Prescaler
When using an output clock from the OSC3
prescaler, it is necessary to turn the OSC3 oscilla-
tion circuit on. Furthermore, the OSC3 oscillation
circuit takes a maximum 20 msec for stabilizing
oscillation after turning the OSC3 oscillation
circuit on. Therefore, wait a long enough interval
after the OSC3 oscillation goes on before turning
the clock output of the OSC3 prescaler on. (The
oscillation start time varies depending on the
oscillator and external components to be used.
Refer to Chapter 8, "ELECTRICAL CHARACTER-
ISTICS", in which an example of oscillation start
time is indicated.)
Input port (K port)
I/O port (P port)
When the input terminal is changed from a low
level to a high level by the built-in pull-up resistor,
the rise of the waveform is delayed on account of
the time constant of the pull-up resistor and load
capacitance of the terminal. Hence, when reading
the input port, it is necessary to wait an appropri-
ate amount of time. Particular care must be taken
of the key scan for the key matrix configuration.
Make this waiting time the amount of time or
more calculated by the following expression.
Waiting time = RIN
× (CIN + CL) × 1.6 [sec]
RIN: Pull-up resistance Max. value
CIN: Terminal capacitance Max. value
CL:
Load capacitance on the board
Clock output
(1) The FOUT3 clock and TOUT0 clock cannot be
output simultaneously, because they use the
same port, similar to the FOUT1 clock and
TOUT1 clock.
(2) Be aware that the output is fixed at low (VSS)
level when the data register of the output port
used for the clock output is set to "0".
(3) A hazard may occur on the output signal when
the clock output control register is changed.
(4) Since the output clock becomes unstable when
SLEEP mode is canceled, stop the output before
shifting to SLEEP mode.
LCD controller
(1) Do not write "0" to the LCDEN register while
the LCD panel is ON. The LCD panel may be
damaged.
(2) Only the 4-bit continuous data refresh mode is
available in the gray-scale mode. Do not use 8-
bit data transfer or another transfer mode.
(3) The data transfer uses the OSC3 clock. There-
fore, turn the OSC3 oscillation on before
writing "1" to the LCDEN register. Further-
more, wait 20 msec or more after turning the
OSC3 oscillation on for stabilizing oscillation.
In the one-shot transfer mode or hardware
auto-transfer mode, do not turn the OSC3
oscillation off before finishing data transfer.
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