Input/Output Interfaces

USB Control

The USB is controlled through I/O registers as listed in table 5-21.

Table 5-21.

USB Control Registers

I/O Address

Register

Default Value

 

 

 

00, 01h

Command

0000h

 

 

 

02, 03h

Status

0000h

 

 

 

04, 05h

Interupt Enable

0000h

 

 

 

06, 07

Frame Number

0000h

 

 

 

08, 0B

Frame List Base Address

0000h

 

 

 

0Ch

Start of Frame Modify

40h

 

 

 

10, 11h

Port 1 Status/Control

0080h

 

 

 

12, 13h

Port 2 Status/Control

0080h

 

 

 

18h

Test Data

00h

 

 

 

5.7.3 USB Connector

These systems provide type-A USB ports as shown in Figure 5-10 below.

1 2 3 4

Figure 5-10. Universal Serial Bus Connector (Female)

Table 5-22.

USB Connector Pinout

Pin

Signal

Description

Pin

Signal

Description

 

 

 

 

 

 

1

Vcc

+5 VDC

3

USB+

Data (plus)

 

 

 

 

 

 

2

USB-

Data (minus)

4

GND

Ground

 

 

 

 

 

 

5-28

361834-002

Technical Reference Guide