FX828D2 datasheet(4/34 Pages) CMLMICRO

4 / 34 page

CTCSS/DCS/SELCALL Processor

FX828

D/828/4

1.3

Signal List

Package

D2/D5/P4

Signal

Description

Pin No.

Name

Type

XTALN

O/P

The inverted output of the on-chip oscillator.

XTAL/CLOCK

I/P

The input to the on-chip oscillator, for external

Xtal circuit or clock.

SERIAL CLOCK

I/P

The "C-BUS" serial clock input. This clock,

produced by the µController, is used for transfer

timing of commands and data to and from the

device. See "C-BUS" Timing Diagram (Figure

4).

COMMAND DATA

I/P

The "C-BUS" serial data input from the

µController. Data is loaded into this device in

8-bit bytes, MSB (B7) first, and LSB (B0) last,

synchronised to the SERIAL CLOCK. See

"C-BUS" Timing Diagram (Figure 4).

REPLY DATA

O/P

The "C-BUS" serial data output to the

µController. The transmission of REPLY DATA

bytes is synchronised to the SERIAL CLOCK

under the control of the CSN input. This 3-state

output is held at high impedance when not

sending data to the µController. See "C-BUS"

Timing Diagram (Figure 4).

CSN

I/P

The "C-BUS" data loading control function: this

input is provided by the µController. Data

transfer sequences are initiated, completed or

aborted by the CSN signal. See "C-BUS"

Timing Diagram (Figure 4).

IRQN

O/P

This output indicates an interrupt condition to

the µController by going to a logic "0". This is a

"wire-ORable" output, enabling the connection of

up to 8 peripherals to 1 interrupt port on the

µController. This pin has a low impedance

pulldown to logic "0" when active and a high-

impedance when inactive. An external pullup

resistor is required.

The conditions that cause interrupts are

indicated in the IRQ FLAG register and are

effective if not masked out by a corresponding

bit in the IRQ MASK register.

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