Sony ICF-7600DA - Page 14

1-25. INITIAL-STATE SETTING
1) tnitial Power-on Setting:
VDD = 0 V > 3.0 V, CE = Low > High
The power-supply is reset after performing the initial power-on setting, and the following operations are made.
a) The power-out terminal becomes in ‘“L” (low) state, i.e., power off, and reads the initial-state setting diodes.
b) Initializes the preset-memories contents of each band (FM, SW or MW) to its lowest frequency. In case of SW band, to that
of the 90-meter band.
c) Initializes the last-channel memories contents of each band (FM, SW or MW) to its lowest frequency. To that of the 90-
meter band in case of SW band.
d) Sets the clock and alarm time to ‘0:00’, and resets the “‘second” starting.
e) Outputs the serial data to turn off all the frequency displays from the LCD, and the LCD displays the following clock
U:O
(24-hour system)
2) Backup Condition:
CE = Low
The backup state is made when the CE terminal becomes in ‘‘L” (low) state. In the backup state, the program routines are
intermittently performed to eliminate the current drain by using the “HALT” command. The operation routine is as follows.
a) The PLL is disabled.
b) All the ports are made into “‘L” (low) state.
c) All the external LCD displays are turned off except the clock display.
Note: The same operations are made in the radio-off state when CE is ““H” (high). In this condition, however, only PAO is
“H” (high), i.e., it is seeing the buzzer switch.
1-2-6. MUTING-OUTPUT TIMINGS
1) MUTE-OUTPUT
The muting-output timings are classified as follows.
1) Approximately 15 (fifteen) ms chattering waiting time at key-on instance.
2) Range checkings and N-value calcuration, and the PLL-data outputting.
3) Data-transferring periods to the LCD display data and to the external LCD displays, key-off detections and the CE-terminal
checking.
a) Radio On
POWER-OUT | (3) —~
fa)
(2)
MUTE Approx.
Approx. 400ms STARTS TO READ
60ms ROTARY ENCODER
b) Radio Off
POWER-OUT
3: FOR TURNING EXTERNAL
LCD DISPLAYS OFF
PLL Approx. o
STOPS 400ms
ALL PORTS BECOME IN
“L" (LOW) EXCEPT PAO
WHICH IS IN “H’ (HIGH)