FS401LF datasheet(66/104 Pages) ETC2

66 / 104 page

FS401, FS403

PRODUCT SPECIFICATION

REV. NO. 1.7

JANUARY 24, 2007

4.5.38 CCR – Configuration Command Register

Configuration Command Register Low (78)

ADDR7

ADDR 6

ADDR 5

ADDR 4

ADDR 3

ADDR 2

ADDR 1

ADDR 0

Configuration Command Register High (79)

CMD3

CMD2

CMD1

CMD0

Reg

Bit#

Bit Name

Description

7-0

ADDR 7-0

Parameter Address

This field contains the address of the configuration parameter to be

accessed.

3-0

CMD3-0

Command

0000

Command complete. The internal controller writes this.

0001

Read from the configuration parameter.

After the command is complete CDR contains the data.

0010

Write to the configuration parameter.

The CDR must contain the data to write before CCR is written.

The CCR and CDR registers are used to access constants and variables inside the internal micro-

controller. The definitions of these parameters are found in section 4.5.40.

To read from a configuration parameter, write 0001 to the command field and the configuration parameter

address in the address field of the CCR. These values must be written with one operation. Next, poll the

CCR until it becomes zero. Be sure to include a delay between polling reads to prevent stopping the

internal CPU from having access to the SIO registers. Then read the CDR to retrieve the value of the

specified configuration parameter.

To write to a configuration parameter, write the data to the CDR. Next, write 0010 to the command field

and the configuration parameter address in the address field of the CCR. When the CCR because zero,

the write operation is complete. Be sure to include a delay between polling reads to prevent stopping the

internal CPU from having access to the SIO registers.

Reset Value:

0x0000

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