User's Manual

LZT 123 1834 57

MSB

LSB

MSB

Frame nFrame n-1 Frame n+1

SSPCLK

SSPFS

SSPDFM

SSPDTM

MSB

LSB

MSB

Frame nFrame n-1 Frame n+1

SSPCLK

SSPFS

SSPDFM

SSPDTM

Figure 5.10-3 PCM Frame format for a continuous transfer

The PCM interface has a Slave mode, however the allocated DSP buffer size limits the

maximum data rate available. A separate Application Note describing slave mode

implementation can be obtained from Sony Ericsson through Customer Support.

5.11 Serial Data Interfaces

The serial channels consist of two UARTs and a USB port. These provide

communication links to the application or accessory units.

The serial channels can be used in differing configurations, depending upon the users

requirements and application. However, the common configuration options are

described:

• UART1 has full RS-232 functionality and is used for all on- and off –line

communication (modem sleep & wake functional control is an integral component

of this interface). Its intended use is that of the primary command (AT) interface.

• UART3 behaves as a general-purpose serial data link. It can be used for data

logging and de-bugging purposes. A GPS device can be used with UART3 as part

of an embedded application.

• The USB port provides a convenient general purpose peripheral (slave) port for use

with host devices which have USB controllers.