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Table Of Contents

Contents
- Figures
- Tables
- Revision History
Preface
- P.1 About the EP93xx User’s Guide
- P.2 Related Documents from Cirrus Logic
- P.3 Reference Documents
- P.4 Notational Conventions
- P.5 Register Example
Introduction
- 1.1 Introduction
- 1.2 EP93xx Features
- 1.3 EP93xx Processor Applications
- 1.4 EP93xx Processor Highlights
ARM920T Core and Advanced High-Speed Bus (AHB)
- 2.1 Introduction
- 2.2 Overview: ARM920T Core
- 2.3 AHB Decoder
MaverickCrunch Co-Processor
- 3.1 Introduction
- 3.2 Programming Examples
  - 3.2.1 Example 1
  - 3.2.2 Example 2
    - 3.2.2.1 C Code
    - 3.2.2.2 MaverickCrunch Assembly Language Instructions
- 3.3 DSPSC Register
- 3.4 ARM Co-Processor Instruction Format
- 3.5 Instruction Set for the MaverickCrunch Co-Processor
Boot ROM
- 4.1 Introduction
  - 4.1.1 Boot ROM Hardware Operational Overview
    - 4.1.1.1 Memory Map
  - 4.1.2 Boot ROM Software Operational Overview
- 4.2 Boot Options
System Controller
- 5.1 Introduction
- 5.2 Registers
Vectored Interrupt Controller
- 6.1 Introduction
- 6.2 Registers
Raster Engine With Analog/LCD Integrated Timing and Interface
- 7.1 Introduction
- 7.2 Features
- 7.3 Raster Engine Features Overview
- 7.4 Functional Details
- 7.5 Registers
Graphics Accelerator
- 8.1 Overview
- 8.2 Block Processing Modes
- 8.3 Line Draws
  - 8.3.1 Breshenham Line Draws
  - 8.3.2 Pixel Step Line Draws
- 8.4 Memory Organization for Graphics Accelerator
- 8.5 Register Programming
  - 8.5.1 Word Count
    - 8.5.1.1 Example: 8 BPP mode
    - 8.5.1.2 Example: 24 BPP (packed) mode
  - 8.5.2 Pixel End and Start
- 8.6 Register Usage
- 8.7 Registers
1/10/100 Mbps Ethernet LAN Controller
- 9.1 Introduction
- 9.2 Descriptor Processor
- 9.3 Registers
DMA Controller
- 10.1 Introduction
- 10.2 Registers
  - 10.2.1 DMA Controller Memory Map
  - 10.2.2 Internal M2P/P2M Channel Register Map
Universal Serial Bus Host Controller
- 11.1 Introduction
  - 11.1.1 Features
- 11.2 Overview
- 11.3 Registers
Static Memory Controller
- 12.1 Introduction
- 12.2 Static Memory Controller Operation
- 12.3 PCMCIA Interface (EP9315 Processor Only)
- 12.4 PC Card Memory-Mode Enable Signals
- 12.5 PC Card Memory Mapping
- 12.6 Registers
  - 12.6.1 Bank Configuration Registers
  - 12.6.2 PCMCIA Configuration Registers (EP9315 Processor Only)
SDRAM, SyncROM, and SyncFLASH Controller
- 13.1 Introduction
- 13.2 Booting from SyncROM or SyncFLASH
- 13.3 Address Pin Usage
- 13.4 SDRAM Initialization
- 13.5 Programming Mode Register: SDRAM Or SyncROM Device
- 13.6 SDRAM Self Refresh
  - 13.6.1 Entering Self Refresh Mode
  - 13.6.2 Exiting Self Refresh Mode
- 13.7 Programming Registers: SyncFLASH Device
- 13.8 External Synchronous Memory System
  - 13.8.1 Chip Select SDCSN[3:0] Decoding
  - 13.8.2 Address/Data/Control Required by Memory System
- 13.9 Registers
UART1 With HDLC and Modem Control Signals
- 14.1 Introduction
- 14.2 UART Overview
- 14.3 Modem
- 14.4 HDLC
- 14.5 UART1 Package Dependency
  - 14.5.1 Clocking Requirements
  - 14.5.2 Bus Bandwidth Requirements
- 14.1 Registers
UART2
- 15.1 Introduction
- 15.2 IrDA SIR Block
- 15.3 UART2 Package Dependency
  - 15.3.1 Clocking Requirements
  - 15.3.2 Bus Bandwidth Requirements
- 15.4 Registers
UART3 With HDLC Encoder
- 16.1 Introduction
- 16.2 Implementation Details
- 16.3 Registers
IrDA
- 17.1 Introduction
- 17.2 IrDA Interfaces
- 17.3 Shared IrDA Interface Feature
- 17.4 Medium IrDA Specific Features
  - 17.4.1 Introduction
    - 17.4.1.1 Bit Encoding
    - 17.4.1.2 Frame Format
  - 17.4.2 Functional Description
- 17.5 Fast IrDA Specific Features
- 17.6 Registers
Timers
- 18.1 Introduction
- 18.2 Registers
Watchdog Timer
- 19.1 Introduction
- 19.1 Registers
Real Time Clock With Software Trim
- 20.1 Introduction
  - 20.1.1 Software Trim
  - 20.1.2 Reset Control
- 20.1 Registers
I2S Controller
- 21.1 Introduction
- 21.2 I2S Transmitter Channel Overview
- 21.3 I2S Receiver Channel Overview
  - 21.3.1 Receiver FIFO’s
- 21.4 I2S Master Clock Generation
- 21.5 I2S Bit Clock Rate Generation
  - 21.5.1 Example of the Bit Clock Generation.
  - 21.5.2 Example of Right Justified LRCK format
- 21.6 Interrupts
- 21.7 Registers
AC’97 Controller
- 22.1 Introduction
- 22.2 Interrupts
  - 22.2.1 Channel Interrupts
  - 22.2.2 Global Interrupts
- 22.3 System Loopback Testing
- 22.4 Registers
Synchronous Serial Port
- 23.1 Introduction
- 23.2 Features
- 23.3 SSP Functionality
- 23.4 SSP Pin Multiplex
- 23.5 Configuring the SSP
- 23.6 Registers
Pulse Width Modulator
- 24.1 Introduction
- 24.2 Theory of Operation
  - 24.2.1 PWM Programming Examples
  - 24.2.2 Programming Rules
- 24.3 Registers
Analog Touch Screen Interface
- 25.1 Introduction
- 25.2 Touch Screen Controller Operation
- 25.3 Registers
Keypad Interface
- 26.1 Introduction
- 26.2 Theory of Operation
- 26.3 Registers
IDE Interface
- 27.1 Introduction
- 27.2 Theory of Operation
- 27.3 Registers
GPIO Interface
- 28.1 Introduction
- 28.2 Registers
Security
- 29.1 Introduction
- 29.2 Features
- 29.3 Contact Information
- 29.4 Registers
Glossary
EP93XX Register List

DS785UM1 25-3

Analog Touch Screen Interface

EP93xx User’s Guide

For 8-wire touch screens, the SX and SY lines are used as the measurement reference for

the analog-to-digital converter to provide better resolution during a reading and compensate

for any drift in samples due to other factors. A 4-wire analog resistive touch screen is the

same as an 8-wire without the SX and SY feedback lines. A 4-wire analog resistive touch

screen may be adequate for non-industrial use or small touch screens.

For 5-wire touch screens and 7-wire (5-wires with feedback) touch screens, a constant

voltage is applied from corner to corner of the lower layer. Switching of the X and Y axis is

performed by driving appropriate voltages on Z+/- and Z-/+. The location values during both

the X and Y scans are then read by sampling the Wiper input. A 7-wire touch screen (5-wires

with feedback), provides reference feedback voltages to the analog-to-digital converter to

eliminate analog switch and other circuit resistances.

The changes in connection for sampling are performed by a set of separately controlled

analog switches. These switches may be connected in a variety of ways which allows a high

degree of flexibility in using the analog-to-digital converter. To avoid contention, each switch

drive circuit has a much faster turn-off than turn-on to provide an overall break-before-make

array function.

Logic safeguards are included to condition the control signals for power connection to the

matrix to prevent part damage. In addition, a software lock register is included that must be

written with 0xAA before each register write to change the values of the four switch matrix

control registers.

Table 25-1 provides switch definitions and the logical safeguards that are implemented to

prevent physical part damage. A “1” in the register bit position closes the corresponding

switch.

Table 25-1. Switch Definitions and Logical Safeguards to Prevent Physical Damage

Switc

CTL

Connection

From

Connection

Only allowed if

Bit 0 X+ ADC input -

Bit 1 X- ADC input -

Bit 2 Y+ ADC input -

Bit 3 Y- ADC input -

Bit 4 sY- ADC input -

Bit 5 sY+ ADC input -

Bit 6 sX- ADC input -

Bit 7 sX+ ADC input -

Bit 8 VBAT ADC input SW8 = HIGH and the bus SW[7-0] = 0x00

Bit 9 AVDD ADC REF+ SW9 = HIGH and SW26 = LOW and SW24 = LOW

Bit 10 AGND ADC REF- -

Bit 11 X+ AGND -

Bit 12 X- AGND -

Bit 13 Y+ AGND -

Bit 14 Y- AGND -

Bit 15 sX+ AGND -

Bit 16 sX- AGND -

Bit 17 sY+ AGND -