Epson S5U1C88348T, Руководство пользователя

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5 STARTING AND QUITTING
I-12
EPSON
S5U1C88348T OPERATION MANUAL
5.4 Initializing
When you connect a power supply or press the [RESET] switch, the system immediately initializes.
Note: If you re-initialize the system by pressing the [RESET] switch, all the data you entered may be lost,
depending on the specific operation performed. (A message will prompt you for confirmation to
proceed with the RESET.)
The contents of the initialization processing are given below.
or power-on
OSC3 oscillation frequency
displayed
To top menu
Initialize I/O registers
NG
OK
SVD check
SHORTAGE OF BATTERY
Change it and Reset
OSC3 = 3.702 MHz
Are you sure to
RESET ? (Y/N)
Y
N
Batteries
replaced?
Y
N
Input [Y] key
RESET
RESET
User data initialized
Message prompting for confirmation
to perform initialization
Fig. 5.4.1 Initialization Flow
(1) Checking the power supply voltage
The S1C88348's SVD circuit detects the power
supply voltage. If the power supply voltage is too
low, the following message appears.
Display:
SHORTAGE OF BATTERY
Change it and Reset
Once this message is displayed, the system will not
perform any processing or accept any key input
other than the [Reset] switch.
(2) Measuring the OSC3 clock frequency
The system calculates the OSC3 clock frequency by
counting the number of instructions executed in a
given period and displays this value on the LCD.
This value is used to set the serial interface clock or
sound output frequency.
Display:
OSC3 = 3.702 MHz
(3) Initializing the I/O registers
The system initializes the values for the I/O regis-
ters.
(4) Initializing the user data
Since initialization clears all user data, you will be
prompted with the following message for confirma-
tion when you press the [RESET] switch.
Display:
Are you sure to
RESET? (Y/N)
Press the [Y] key to initialize user data or any other key to leave it unchanged. This message does not
appear when starting up for the first time after battery replacement, since in such cases all data needs to
be initialized.
Pressing the [Y] key or starting after battery replacement initializes user data in internal and external
RAM, as shown below.
All user data ................................ Cleared to 0
Mode ............................................. Top menu
[Char], [Caps], [Shift] states ..... All turned off
Date ............................................... January 1, 1999 0:00 a.m.
12/24-hour display selection ... 24-hour display
LCD contrast ............................... Intermediate value (7)
Sound data ................................... Two melodies, "Greensleeves" and "Long Long Ago," are loaded.