Silan

Semiconductors

SC9256

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

REV: 1.0

2002.01.30.

14

T1

START bit set to "1"

End

T2

PERIOD

BUSY bit

Gate

Binary

counter

input

Clock pulse to be measured

Frequency measurement timing chart

0<T1

≤0.25(µs), 0<T2 ≤1(ms)

low amplitude.

General-purpose I/O ports

These LSIs feature general-purpose output and I/O ports which are controlled through the serial ports.

Input/output form

port

Input/output configuration

Output port

Dedicated: 4 ports

N channel open-drain output

I/O ports

Dedicated: 1 port,

Maximum: 5 ports

CMOS input/output

1.

General-purpose output ports (OT-1~OT-4)

Pins OT-1~OT-4 are general-purpose dedicated output ports. They have such uses as control signal output.

They are configured for N channel open-drain output and have an off withstanding voltage of 12V.

The data set in bits O1~O4 of the input register (D2H) are output in parallel from their correspond dedicated

output port pins OT-1~OT-4. SC9256 do not have dedicated output port OT-4, but setting the input register

(D2H) CLK (O4C) bit to “1” converts pin DO2 into output port OT-4 (configured for CMOS output).

The data set in bits O1~O4 of the input register (D2H) can also be read from the DATA pins as output register

(D3H) serial data O1~O4.