EP7309-CB datasheet(8/51 Pages) CIRRUS

Part #	EP7309-CB

Description	High-performance, Low-power, System-on-chip with Enhanced Digital Audio Interface

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Manufacturer	CIRRUS [Cirrus Logic]

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©Copyright Cirrus Logic, Inc. 2005

DS507F1

EP7309

High-Performance, Low-Power System on Chip

Synchronous Serial Interface

•

ADC (SSI) Interface: Master mode only; SPI and

Microwire1-compatible (128 kbps operation)

•

Selectable serial clock polarity

LCD Controller

A DMA address generator is provided that fetches video

display data for the LCD controller from memory. The display

frame buffer start address is programmable, allowing the LCD

frame buffer to be in SDRAM, internal SRAM or external

SRAM.

•

Interfaces directly to a single-scan panel monochrome STN

LCD

•

Interfaces to a single-scan panel color STN LCD with

minimal external glue logic

•

Panel width size is programmable from 32 to 1024 pixels in

16-pixel increments

•

Video frame buffer size programmable up to

128 KB

•

Bits per pixel of 1, 2, or 4 bits

64-Keypad Interface

Matrix keyboards and keypads can be easily read by the

EP7309. A dedicated 8-bit column driver output generates

strobes for each keyboard column signal. The pins of Port A,

when configured as inputs, can be selectively OR'ed together

to provide a keyboard interrupt that is capable of waking the

system from a STANDBY or IDLE state.

•

Column outputs can be individually set high with the

remaining bits left at high-impedance

•

Column outputs can be driven all-low, all-high, or all-high-

impedance

•

Keyboard interrupt driven by OR'ing together all Port A

bits

•

Keyboard interrupt can be used to wake up the system

•8

×8 keyboard matrix usable with no external logic, extra

keys can be added with minimal glue logic

Interrupt Controller

When unexpected events arise during the execution of a

program (i.e., interrupt or memory fault) an exception is

usually generated. When these exceptions occur at the same

time, a fixed priority system determines the order in which

they are handled. The EP7309 interrupt controller has two

interrupt types: interrupt request (IRQ) and fast interrupt

request (FIQ). The interrupt controller has the ability to control

interrupts from 22 different FIQ and IRQ sources.

•

Supports 22 interrupts from a variety of sources (such as

UARTs, SSI1, and key matrix.)

•

Routes interrupt sources to the ARM720T’s IRQ or FIQ

(Fast IRQ) inputs

•

Five dedicated off-chip interrupt lines operate as level

sensitive interrupts

.

Note:

Pins are multiplexed. See Table 18 on page 10 for

more information.

Real-Time Clock

The EP7309 contains a 32-bit Real Time Clock (RTC) that can

be written to and read from in the same manner as the timer

counters. It also contains a 32-bit output match register which

can be programmed to generate an interrupt.

•

Driven byan external 32.768 kHz crystal oscillator

Pin Mnemonic

I/O

Pin Description

ADCLK

O

SSI1 ADC serial clock

ADCIN

I

SSI1 ADC serial input

ADCOUT

O

SSI1 ADC serial output

nADCCS

O

SSI1 ADC chip select

SMPCLK

O

SSI1 ADC sample clock

Table 7. Serial Interface Pin Assignments

Pin Mnemonic

I/O

Pin Description

CL1

O

LCD line clock

CL2

O

LCD pixel clock out

DD[3:0]

O

LCD serial display data bus

FRM

O

LCD frame synchronization pulse

M

O

LCD AC bias drive

Table 8. LCD Interface Pin Assignments

Pin Mnemonic

I/O

Pin Description

COL[7:0]

O

Keyboard scanner column drive

Table 9. Keypad Interface Pin Assignments

Pin Mnemonic

I/O

Pin Description

nEINT[2:1]

I

External interrupt

EINT[3]

I

External interrupt

nEXTFIQ

I

External Fast Interrupt input

nMEDCHG/nBROM

(Note)

I

Media change interrupt input

Table 10. Interrupt Controller Pin Assignments

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