EP7309 datasheet(5/46 Pages) CIRRUS

Part #	EP7309

Description	HIGH PERFORMANCE LOW POWER SYSTEM ON CHIP ENHANCED DIGITAL AUDIO INTERFACE

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Manufacturer	CIRRUS [Cirrus Logic]

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DS507PP1

5

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 R on page 7 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.

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 G. 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 H. LCD Interface Pin Assignments

Pin Mnemonic

I/O

Pin Description

COL[7:0]

O

Keyboard scanner column drive

Table I. 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 J. Interrupt Controller Pin Assignments

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