EP7312-CR-90 datasheet(9/64 Pages) CIRRUS

Part #	EP7312-CR-90

Description	High-performance, Low-power, System-on-chip with SDRAM & Enhanced with SDRAM & Enhanced

Download	64 Pages

Scroll/Zoom	100%

Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

Logo

9 / 64 page

DS508F1

©Copyright Cirrus Logic, Inc. 2005

9

EP7312

High-Performance, Low-Power System on Chip

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. The Keypad

Interface has these features:

•

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

Table 10 shows the Keypad Interface Pin Assignments.

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 EP7312 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. The

Interrupt controller has these features:

•

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

Table 11 shows the interrupt controller pin assignments.

.

Note:

Pins are multiplexed. See Table 19 on page 11 for

more information.

Real-Time Clock

The EP7312 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 by an external 32.768 kHz crystal oscillator

Table 12 shows the Real-Time Clock pin assignments.

PLL and Clocking

The EP7312 processor and peripheral clocks have these

features:

•

Processor and peripheral clocks operate from a single

3.6864 MHz crystal or external 13 MHz clock

•

Programmable clock speeds allow the peripheral bus to run

at 18 MHz when the processor is set to 18 MHz and at

36 MHz when the processor is set to 36, 49 or 74 MHz, and

at 45 MHz when the processor is set to 90 MHz.

Table 13 shows the PLL and clocking pin assignments.

Table 10. Keypad Interface Pin Assignments

Pin Mnemonic

I/O

Pin Description

COL[7:0]

O

Keyboard scanner column drive

Table 11. Interrupt Controller 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 12. Real-Time Clock Pin Assignments

Pin Mnemonic

Pin Description

RTCIN

Real-Time Clock Oscillator Input

RTCOUT

Real-Time Clock Oscillator Output

VDDRTC

Real-Time Clock Oscillator Power

VSSRTC

Real-Time Clock Oscillator Ground

Table 13. PLL and Clocking Pin Assignments

Pin Mnemonic

Pin Description

MOSCIN

Main Oscillator Input

MOSCOUT

Main Oscillator Output

VDDOSC

Main Oscillator Power

VSSOSC

Main Oscillator Ground

Similar Part No. - EP7312-CR-90

Manufacturer	Part #	Datasheet	Description
Cirrus Logic	EP7312-CR-90	1Mb / 64P	HIGH-PERFORMANCE, LOW-POWER SYSTEM ON CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE

More results

Similar Description - EP7312-CR-90

Manufacturer	Part #	Datasheet	Description
Cirrus Logic	EP7311	1Mb / 58P	High-performance, Low-power, System-on-chip with SDRAM & Enhanced Digital Audio Interface
	EP7311	1Mb / 54P	HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE
	EP7312	1Mb / 64P	HIGH-PERFORMANCE, LOW-POWER SYSTEM ON CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE
	EP7309	1Mb / 51P	High-performance, Low-power, System-on-chip with Enhanced Digital Audio Interface
	EP7309	1Mb / 46P	HIGH PERFORMANCE LOW POWER SYSTEM ON CHIP ENHANCED DIGITAL AUDIO INTERFACE
Freescale Semiconductor...	33742	1Mb / 70P	System Basis Chip with Enhanced High Speed CAN Transceiver
Cirrus Logic	EP9315	1Mb / 64P	Enhanced Universal Platform System-on-Chip Processor
Cirrus Logic	EP7211	2Mb / 166P	HIGH-PERFORMANCE ULTRA-LOW-POWER SYSTEM-ON-CHIP WITH LCD CONTROLLER
Luminus, Inc	MP-3030-12ZH	1Mb / 14P	Ultra High-Performance with Enhanced ESD Protection
Freescale Semiconductor...	33742	2Mb / 65P	System Basis Chip (SBC) with Enhanced High-Speed CAN Transceiver

More results

EP7312-CR-90 Datasheet(PDF) 9 Page - Cirrus Logic

EP7312-CR-90 Datasheet(HTML) 9 Page - Cirrus Logic

Similar Part No. - EP7312-CR-90

Similar Description - EP7312-CR-90

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

Datasheet Download

Link URL