
ii
Table of Contents
EZ-USB TRM v1.9
1.16
1.17
1.18
1.19
1.20
EZ-USB CPU ..................................................................................2-1
2.1
Introduction .............................................................................................2-1
2.2
8051 Enhancements ................................................................................2-1
2.3
EZ-USB Enhancements ..........................................................................2-2
2.4
EZ-USB Register Interface .....................................................................2-2
2.5
EZ-USB Internal RAM ...........................................................................2-3
2.6
I/O Ports ..................................................................................................2-3
2.7
Interrupts .................................................................................................2-4
2.8
Power Control .........................................................................................2-5
2.9
SFRs ........................................................................................................2-6
2.10
Internal Bus .............................................................................................2-7
2.11
Reset ........................................................................................................2-7
EZ-USB Memory ............................................................................3-1
3.1
Introduction .............................................................................................3-1
3.2
8051 Memory ..........................................................................................3-2
3.3
Expanding EZ-USB Memory .................................................................3-4
3.4
CS# and OE# Signals ..............................................................................3-5
3.5
EZ-USB ROM Versions .........................................................................3-7
EZ-USB Input/Output ...................................................................4-1
4.1
Introduction .............................................................................................4-1
4.2
IO Ports ...................................................................................................4-2
4.3
IO Port Registers .....................................................................................4-5
4.4
I2C Controller .........................................................................................4-6
4.5
8051 I2C Controller ................................................................................4-6
4.5.1
START ......................................................................................4-8
4.5.2
STOP ........................................................................................4-8
4.6
Control Bits .............................................................................................4-8
4.6.1
LASTRD ...................................................................................4-9
4.6.2
DONE .......................................................................................4-9
4.6.3
ACK ..........................................................................................4-9
4.7
Status Bits ...............................................................................................4-9
4.7.1
BERR ......................................................................................4-10
Reset and Power Management ..............................................................1-15
EZ-USB Product Family .......................................................................1-16
Summary of AN2122, AN2126 Features .............................................1-16
Revision ID ...........................................................................................1-17
Pin Descriptions ....................................................................................1-18
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