LC723661, 723662, 723663

No.0460-9/12

Continued from preceding page.

Pin name

Pin No.

I/O

Pin explanation

Equivalent circuit

XIN

XOUT

1

80

I

O

Connections for 4.5MHz/7.2MHz crystal oscillator element

EO1

EO2

78

77

O

Main charge pump outputs.

These pins output a high level when the frequency of the local

oscillator divided by n is higher than that of the reference frequency,

and they output a low level when that frequency is lower.

They go to the high-impedance state when the frequencies match.

These pins go to the high-impedance state in Backup mode, after a

power on reset, and in the PLL stopped state.

VDDPORT

VDDPLL

31

73

-

+ pin of power supply (These pins must connected to VDD.)

The VDDPORT pin is mainly supply power for the peripheral I/O

blocks.

The VDDPLL pin is mainly for the PLL circuits and the regulator.

VSSCPU

VSSPORT

VSSADC

VSSPLL

4

32

65

76

Power supply ground pin (These pins must be connected to ground.)

The VSSPORT pin is mainly supply power for the peripheral I/O

blocks.

The VSSPLL pin is mainly for the PLL circuits and the regulator.

The VSSCPU pin is mainly used by the CPU block.

The VSSADC pin is mainly used by the ADC block.

VREG

3

O

Internal low voltage output.

Connect a bypass capacitor to this pin.

FMIN

75

I

FM VCO (local oscillator) input.

This pin is selected with CW1 in the PLL instruction.

The signal input to this pin must be capacitor coupled.

Input is disabled in Backup mode, after a power on reset, and in the

PLL stopped state.

AM VCO (local oscillator) input.

This pin is selected and the band set with CW1 (b1, b0) in the PLL

instruction.

b1

b0

Band

1

0

2 to 40MHz (SW, AM upconversion)

1

1

0.5 to 10MHz (MW, LW)

AMIN

74

I

The signal input to this pin must be capacitor coupled.

Input is disabled in Backup mode, after a power on reset, and in the

PLL stopped state.

HCTR

72

I

Universal counter and general-purpose input shared function input port.

The IOS1 instruction is used for switching between the universal

counter and general-purpose input functions.

• When used for frequency measurement :

The universal counter function is set up with the IOS1 instruction.

The counter is controlled using UCS and UCC instructions.

Since this pin functions as an AC amplifier in this mode, the input

signal must be input with capacitor coupling.

• When used as a general-purpose input pin :

The general-purpose input function is set up with the IOS1

instruction.

Data is read from the port using the INR (b0) instruction.

Input is disabled in Backup mode. (The input pin will be pulled down.)

The universal counter function is selected after a power on reset.

Continued on next page.

ILC05534

XIN

XOUT

ILC05535

ILC05536

PLL Stop instruction