FDC37C78-HT datasheet(62/82 Pages) MICROCHIP

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CONFIGURATION

The configuration of the chip is programmable

through

software

selectable

configuration

registers.

CONFIGURATION REGISTER ADDRESS

The

Configuration

Registers

are

located

address offset +0 and +1 with nCS active.

CONFIGURATION REGISTERS

The configuration registers are used to select

programmable options of the chip. After power up,

the chip is in the default mode. The default modes

are identified in the Configuration Mode Register

Description.

program

the

configuration

registers,

the

following

sequence

must

followed:

Enter Configuration Mode.

Configure the Configuration Registers.

Exit Configuration Mode.

Enter Configuration Mode

To enter the configuration mode, two writes in

succession to port +0 with 55H data are required.

If a write to another address or port occurs

between these two writes, the chip does not enter

the

configuration

mode.

strongly

recommended that interrupts be disabled for the

duration of these two writes.

Configuration Mode

The chip contains configuration registers CR00-

CR1F.

These registers are accessed by first

writing the number (0-1FH) of the desired register

to port +0 and then writing or reading the

configuration register through port +1.

Exit Configuration Mode

The configuration mode is exited by writing an

AAH to port +0.

Programming Example

The following is an example of a configuration

program in Intel 8086 assembly language and

assumes that the base address is set to 3F0H.

FDC37C78-HT Datasheet(PDF) 62 Page - Microchip Technology

FDC37C78-HT Datasheet(HTML) 62 Page - Microchip Technology

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