FX839 datasheet(4/22 Pages) CMLMICRO

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Analogue Control Interface

FX839

D/839/4

1.3

Signal List

Package

P4/D2/D5

Signal

Description

Pin No.

Name

Type

XTALN

O/P

The inverter 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 disabled.

ADCIN1

I/P

Analogue to digital converter input 1 (ADC1)

ADCIN2

I/P

Analogue to digital converter input 2 (ADC2)

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