Sony ICF-SW1 - Page 12

ICF-SW1 | | a
AN-101
2-1-3. INITIAL-STATE SETTING
1) Initial 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 figures from 0 to 9 to its 150 kHz frequency.
c) Initializes the last-channel memories contents of the above each cases to its 150 kHz frequency.
d) Sets the clock and alarm time to ‘‘0:00’’, and resets the “‘second” starting.
e) And the LCD displays the following clock display.
(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) LCD displays remains only for the clock display.
Note: The same operations are made in the radio-off state when CE is “H” (high).
2-1-4. MUTING-OUTPUT TIMINGS
1) MUTE-OUTPUT
1 Allowance for key-on chattering (approx. 15msec).
2 Range check, N count, and PLL DATA output.
MUTE: Mute mode at low level.
a) RADIO ON
[-—Aeorox. 500ms——»|
POWER ON
ID@
MUTE Se
b) RADIO OFF
POWER OFF OT ee
Approx. 5ms
C) Preset selection, Direct selection, Band switching (Band UP/DOWN, manual selection).
Approx 400ms —»|
MUTE ee ee
When preset memory
button pressed.