EP7309-IV-C datasheet(6/46 Pages) CIRRUS

Part #	EP7309-IV-C

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

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Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

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DS507PP1

EP7309

High-Performance, Low-Power System on Chip

• Driven byan external 32.768 kHz crystal oscillator

PLL and Clocking

• 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

DC-to-DC converter interface (PWM)

• Provides two 96 kHz clock outputs with

programmable duty ratio (from 1-in-16 to 15-in-16)

that can be used to drive a positive or negative DC to

DC converter

Timers

• Internal (RTC) timer

• Two internal 16-bit programmable hardware count-

down timers

General Purpose Input/Output (GPIO)

• Three 8-bit and one 3-bit GPIO ports

• Supports scanning keyboard matrix

Note:

Pins are multiplexed. See Table R on page 7 for more

information.

Hardware debug Interface

• Full JTAG boundary scan and Embedded ICE

support

LED Flasher

A dedicated LED flasher module can be used to generate

a low frequency signal on Port D pin 0 for the purpose of

blinking an LED without CPU intervention. The LED

flasher feature is ideal as a visual annunciator in battery

powered applications, such as a voice mail indicator on a

portable phone or an appointment reminder on a PDA.

• Software adjustable flash period and duty cycle

• Operates from 32 kHz RTC clock

• Will continue to flash in IDLE and STANDBY states

• 4 mA drive current

Note:

Pins are multiplexed. See Table R on page 7 for more

information.

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 K. Real-Time Clock Pin Assignments

Pin Mnemonic

Pin Description

MOSCIN

Main Oscillator Input

MOSCOUT

Main Oscillator Output

VDDOSC

Main Oscillator Power

VSSOSC

Main Oscillator Ground

Table L. PLL and Clocking Pin Assignments

Pin Mnemonic

I/O

Pin Description

DRIVE[1:0]

I/O

PWM drive output

FB[1:0]

I

PWM feedback input

Table M. DC-to-DC Converter Interface Pin Assignments

Pin Mnemonic

I/O

Pin Description

PA[7:0]

I

GPIO port A

PB[7:0]

I

GPIO port B

PD[0]/LEDFLSH

(Note)

I/O

GPIO port D

PD[5:1]

I/O

GPIO port D

PD[7:6]/SDQM[1:0]

(Note)

I/O

GPIO port D

PE[1:0]/BOOTSEL[1:0] (Note)

I

GPIO port E

PE[2]/CLKSEL

(Note)

I

GPIO port E

Table N. General Purpose Input/Output Pin Assignments

Pin Mnemonic

I/O

Pin Description

TCLK

I

JTAG clock

TDI

I

JTAG data input

TDO

O

JTAG data output

nTRST

I

JTAG async reset input

TMS

I

JTAG mode select

Table O. Hardware Debug Interface Pin Assignments

Pin Mnemonic

I/O

Pin Description

PD[0]/LEDFLSH

(Note)

O

LED flasher driver

Table P. LED Flasher Pin Assignments

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