LC723461W View Datasheet(PDF) - SANYO -> Panasonic
Part Name
Description
Manufacturer
LC723461W Datasheet PDF : 13 Pages
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LC723461W, 723462W
Continued from preceding page.
Pin No.
Pin
I/O
Function
56
RES
System reset input.
I In CPU operating mode or halt mode, applications must apply a low level for at least
one full machine cycle to reset the system and restart execution with the PC set to
location 0. This pin is connected in parallel with the internal power on reset circuit.
I/O circuit
28 VDDRAMVADJ I RAM backup power supply. Connected to the VDC3 voltage through a diode.
Output for the 3 V step-up circuit clock. Outputs 1/2 the AM local oscillator frequency
30
VDC1
O in AM reception mode, and 1/256 the FM local oscillator or 75 kHz in FM reception
mode.
29
VDC3
Voltage stepped up by the DC-DC converter (3 V)
I
May also be used to input an equivalent voltage.
26
VREF
VDC3 reference voltage input.
I
When 0.7 V is input, the VDC3 voltage will be 3 V.
The VDC3 sample-to-sample variations can be held to ±3% by attaching an external
metal-film resistor and a zener diode.
LCD driver intermediate potential output.
55
COMC
O The COM waveform must be stabilized by attaching an external capacitor of about
0.1 µF.
59
FMIN
FM VCO (local oscillator) input.
This pin is selected with the PLL instruction CW1.
I
The input must be capacitor coupled.
Input is disabled in backup mode, in halt mode, after a reset, and in PLL stop mode.
CMOS amplifier input
60
AMIN
57
HCTR
AM VCO (local oscillator) input.
This pin and the bandwidth are selected with the PLL instruction CW1.
CW1 b1, b0
Input pins
Bandwidth
I
11
FMIN (L)
0.5 to 10 MHz (MW, LW)
The input must be capacitor coupled.
Input is disabled in backup mode, in halt mode, after a reset, and in PLL stop mode.
General-purpose input and universal counter input shared-function port. The IOS
instruction is used to switch between the general-purpose input port and the universal
counter input functions.
• When performing frequency measurements, select the HCTR frequency
measurement mode and the measurement time with the UCS instruction (b3 = 0, b2
= 0), and start the count with the UCC instruction.
UCS b3, b2
00
01
10
Input pins
HCTR
—
—
Measurement mode
Frequency measurement
I
UCS b1, b0
Measurement time
00
1 ms
01
4 ms
10
8 ms
11
32 ms
The CNTEND flag is set when the count completes. Since this circuit operates as an
AC amplifier in this mode, the input signal must be capacitor coupled.
When used as a general-purpose input, the input data is acquired with the INR
instruction.
Input is disabled in backup mode, halt mode, during a reset, and in PLL stop mode.
Note that after a reset, the universal counter input port function will be selected.
CMOS amplifier input
CMOS amplifier input
Continued on next page.
No. 7275-9/13
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