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MC145540

ADPCM Codec

Motorola => Freescale 

3

SERIAL CONTROL PORT REGISTERS

3.1 INTRODUCTION

This section describes all of the MC145540 ADPCM Codec control and status registers available via the

Serial Control Port (SCP) Interface. A Register Map is given in Table 3-2. Each register is then de-

scribed in detail.

3.2 REGISTER MAP

The SCP register map consists of 16 byte registers. Registers BR0–BR5 and BR7–BR10 provide

external control of and status of the part. Register BR15 holds the value of the mask number for the

particular MC145540. BR6 and BR11–BR14 are not defined and as such are presently reserved.

3.3 BIT DESCRIPTION LEGEND

Each bit described in the following sections has a read/write indicator associated with it. The read/write

indicator, shown in the lower right corner of each bit, shows what type of bit resides there. The options

are described in Table 3-1.

Table 3-1. Bit Read/Write Indicator

Indicator

rw

ro

ro/wo

Type

Description

Read/Write A Read/Write bit may be written to by the external microcontroller. The

information that is read back will be the data that was written.

Read Only A Read Only bit may only be read by the external microcontroller. Writing to it

has no effect unless otherwise specified in the text. When the text says that an

“ro” bit is set or cleared, this operation is performed internally by the MC145540.

Read Only/

Write Only

A Read Only/Write Only bit may be written to by the external microcontroller.

However, the value that is read back by the external microcontroller is not

necessarily the value that was written. An “ro” bit is set and cleared by some

internal operation in the MC145540.

NOTE

“Setting” a bit corresponds to writing a one to the register and “clearing” a bit corresponds

to writing a zero to the register.

MOTOROLA

MC145540

3-1

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