SC9257 データシートの表示（PDF） - Silan Microelectronics

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SC9257

0.3-6.0V PLL for digital tuning systems (DTS)

Silan Microelectronics 

Silan

Semiconductors

SC9257

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,

CMOS input/output

Maximum: 5 ports

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.

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.

(1) SC9257

LSB

Address D2H

O1 O2 O3 O4

MSB

O1~O4

0

1

PIN OUTPUT STATE

OT-1~OT-4

High impedance

(N channel open drain output =off)

"L" level

(N channel open drain output =on)

(2)output register … The data set in bits O1~O4 of the input register can read as serial data O1~O4 from the output

register (D3H).

LSB

Address D2H

LSB

Address D3H

O1 O2 O3 O4

O1 O2 O3 O4

MSB

Input

register

MSB

Output

register

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

REV: 1.0

17

2001.10.18

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