FS401LF datasheet(52/104 Pages) ETC2

52 / 104 page

FS401, FS403

PRODUCT SPECIFICATION

REV. NO. 1.7

JANUARY 24, 2007

4.5.25 General Purpose Outputs

General Purpose Outputs Low (34)

GPO7

GPO6

GPO5

GPO4

GPO3

GPO2

GPO1

GPO0

General Purpose Outputs High (35)

Bit#

Bit Name

Description

7-0

GPO7-0

General Purpose Output bits [7:0]. The General Purpose

Output bits control the GPO pins on the FS400. The FS403 has

all 8 GPO outputs available while the FS401 has only GPO6 and

GPO0 available. On readback, the value read is the value written,

not necessarily the voltage level.

7-0

07-0

Reserved: Always set these bits to 0. Any other value will place

the FS400 into a manufacturing test mode.

Note: When the internal microprocessor is running, GPO0 is under the control of the microprocessor

(see CCR_FLT_FREQ in section 4.5.40).

In order to modify the GPO register, one must first change the Configuration Command Register

CCR_GPO at CCR address 0x20. After the CCR_GPO register is programmed, the exact same GPO

value must be programmed into the General Purpose Outputs register (see above).

Bit 0 of the GPO register is always reserved. When programming the CCR_GPO register it is ok to write

an 8-bit value. The system will ignore bit 0. When programming the General Purpose Outputs register

(see above), first read the register to get the current state of bit 0, change bits 1-7 as desired, then write

the new value into the register.

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