USB100 查看數據表（PDF） - Fairchild Semiconductor

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产品描述 (功能)

生产厂家

USB100

Programmable Low-Cost USB Machine (PLUM)

Fairchild Semiconductor 

H1 or V1 or H3

H2 or V2 or H4

Negative Counting

H1 or V1 or H3

H2 or V2 or H4

Positive Counting

v

Q1

USB100

D1

Q2

H1

D2

H2

F

Schematic 1: Roller Mode of Operation

When the Roller configuration register is used to define an input

pair as roller inputs, the corresponding roller movement reporting

is enabled. In this case, internally, the roller wheel pulses are

counted and registered into an 8 bit register. One register is

available per input pair. A total of three rollers movement registers

(RMRs) are available, corresponding to the three roller mecha-

nisms available. On all the input pairs (H1, H2 or V1, V2 or H3, H4)

the positive counting sequence is defined as (0,0), (0,1), (1,1) and

(0,0) and the same sequence repeating over again. Negative

counting sequence is defined as (0,0), (1,0), (1,1) and (0,1) and

the same sequence repeating again. Each of the above transitions

will result in the counter incrementing or decrementing by one

depending on whether the rollers are moving in the positive or

negative direction. Each time an IN query is sent on endpoint 1, the

counter contents are transferred to a temporary holding register

and queued for transmission on the USB. When an ACK is

received for the current transaction, the counter is cleared.

Hardware Features

Roller / Potentiometer Interface

One of the key differences between the mouse and joystick

hardware implementation is that themouse uses optical encoding

v

P1

P2

USB100

H1

V1

USB100 rev.D

Schematic 2 : Potentiometer Mode of

Operation for Joystick

7

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