Continued from preceding page.

Note: *1. Since the output port states are undefined when power is first applied, transfer the control data quickly.

Control Data Format (serial input data)

No. 4758-7/16

LC7218, 7218M, 7218JM

Pin No.

Symbol

I/O

Type

Function

9

10

11

12

13

14

17

7

8

16

15

OUT0

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

IN0

IN1

HCTR

LCTR

Input

Input

Output port

Input port

General-purpose

counter

Frequency

measurement signal

input pin

General-purpose

counter

Frequency or period

measurement signal

input pin

that data and output the inverted data in parallel.

• The OUT0 pin can also be used to output an 8 Hz clock time base signal.

(When TB is 1.)

• OUT1 and OUT2 are complementary outputs.

• OUT0, OUT3, OUT4, OUT5 and OUT6 are N-channel open drain outputs that can

handle up to 13 V.

• The values of the IN0 and IN1 input ports can be converted from parallel to serial and

output from the DO output pin.

• HCTR is selected when SC in the serial input data is set to 1.

• Input frequency range: 10 to 60 MHz (70 mVrms minimum)

• The signal is supplied to a general-purpose 20-bit binary counter after passing through a

divide-by-eight circuit. Therefore, the value of the counter is 1/8 of the frequency actually

input to HCTR.

• When HCTR is selected the LC7218 will function in frequency measurement mode

and the measurement period can be selected to be either 60 or 120 ms. (GT = 0: 60 ms,

1: 120 ms)

• The result of the measurement (the value of the general-purpose counter) can be output

MSB first from the DO output pin.

• LCTR is selected when SC in the serial input data is set to 0.

• When SF in the serial input data is set to 1:

— Frequency measurement mode is selected.

— Input frequency range: 15 to 500 kHz (70 mVrms minimum).

— The signal is supplied directly to the general-purpose counter without passing

through the internal divide-by-eight circuit.

— The measurement period is the same as for HCTR.

• When SF in the serial input data is set to 0:

— Period measurement mode is selected.

maximum)

— The measurement can be selected to be for one or two cycles. If two cycle

measurement is selected the input frequency range becomes 2 Hz to 20 kHz.

(GT = 0: one cycle, 1: two cycles)

• Measurement results are output in the same manner as HCTR measurement results.