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KRG-2001
CIRCUIT DESCRIPTION
2. KEY
MATRIX
DESCRIPTION
(1) The switch for setting the receiving frequency range
and the channel spacing:
2-1.
Diode Matrix for Initialization
BAND A
The diode matrix for initialization has the following five
status. All status is read out only when the power is sup-
(2) Clock signal select switch:
plied to the Vpp for the first time (Power-ON, Reset) and
CLKSEL
when the CE pin goes high from low level (CE Reset), in
PRIORITY
(4) —
(5) NR select switch:
NR SEL
(6) CLOCK/FREQUENCY select switch:
CLOCK/FRO
(7) LW select switch:
BAND B
Symbol
Function Description
This switch is used for setting the receiving frequency range for each FM/MW/LW band channel spacing. Each setting
status is as follows:
BAND A
BAND A
Frequency Range
Channel Spacing
Manual Step
:
| 1 | 87.9~107.9MH2
2oorkz
| =
| 1 | s30~te20KH | torte
|
| o | 87.
p 25kHe |
522~1611 kHz
When the clock function is provided, this switch selects the priority mode for display.
When the display which does not have priority is recalled, the mode having priority will be displayed after approx.
PRIORITY
5 seconds.
"1: No priority
;
:
"0": Priority is provided.
,
g75~1080MHz | —
SOkHz
:
Select switch to provide the clock function or not.
CLKSEL
"1": Clock is not provided (For back-up, RAM is not cleared)
;
"0": Clock is provided.
Select switch to provide the NR (noise reduction) function.
"0": NR is not provided (WIDE-ADV and BAND 2 output pin)
"1: NR provided
Select switch to provide priority to the clock or frequency for display (Depending on PRIORITY)
CLOCK/FRQ
"O": Frequency
"1: Clock
Switch to access the preset memory (M1 to M6) sequentially
"0": M1 to M6 keys are preset independently
"1": Each time the M1 key is pressed, preset memory is sent sequentially
CM
Mey
13
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