LC723764 查看數據表（PDF） - SANYO -> Panasonic
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LC723764 Datasheet PDF : 14 Pages
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LC723732/40/48/56/64
Continued from preceding page.
Pin No. Symbol
I/O
Function
Sub-charge pump output and general-purpose input shared function port
The IOS2 instruction is used for switching between the sub-charge pump output and
general-purpose input functions.
• When used as the sub-charge pump output:
The sub-charge pump output function is set up with the IOS2 instruction.
A high-speed locking circuit can be formed by using this pin in conjunction with the
main charge pump.
The sub-charge pump is controlled using the DZC instruction.
92
SUBPD
I/O
b3 b2
Operation
0
0 High impedance
0
1 Only operates when the PLL is unlocked (450 kHz)
1
0 Only operates when the PLL is unlocked (900 kHz)
1
1 Normal operation
• When used as a general-purpose input:
The general-purpose input function is set up with the IOS2 instruction.
Data is read from the port using the INR instruction.
This pin goes to the high-impedance state in backup mode, after a power on reset,
and in the PLL stopped state.
Second PLL charge pump output and general-purpose input shared function port
The IOS2 instruction is used for switching between the second PLL charge pump
output and general-purpose input functions.
• When used as a charge pump output:
The charge pump output function is set up with the IOS2 instruction.
This pin outputs a low level when the frequency of the local oscillator divided by n
is higher than that of the reference frequency, and it outputs a high level when that
91
E03
I/O frequency is lower. It goes to the high-impedance state when the frequencies
match. (Note that the logic of this pin is inverted from that of the EO1 and EO2
pins.)
• When used as a general-purpose input:
The general-purpose input function is set up with the IOS2 instruction.
Data is read from the port using the INR instruction.
This pin goes to the high-impedance state in backup mode, after a power on reset,
and in the PLL stopped state.
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 the UCS and UCC instructions.
90
HCTR
I
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.
Universal counter (frequency or period measurement) 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.
Set up LCTR frequency measurement mode with the UCS instruction, and control
operation with the UCC instruction. Since this pin functions as an AC amplifier in
this mode, the input signal must be input with capacitor coupling.
89
LCTR
I
• When used for period measurement:
The universal counter function is set up with the IOS1 instruction.
Set up LCTR frequency measurement mode with the UCS instruction, and control
operation with the UCC instruction. Since the bias feedback resistor is
disconnected in this mode, the input signal must be input with DC coupling.
• When used as a general-purpose input pin:
The general-purpose input port function is set up with the IOS1 instruction.
Data is read from the port using the INR (b1) instruction.
Input is disabled in backup mode. (The input pin will be pulled down.)
The universal counter function (HCTR frequency measurement mode) is selected
after a power on reset.
Equivalent circuit
Continued on next page.
No. 5931-9/14
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