M30245 datasheet(13/367 Pages) RENESAS

13 / 367 page

Rev.2.00 Oct 16, 2006

page 4 of 354

REJ09B0340-0200

M30245 Group

2. Protect

2.1.1 Overview

'Protect' is a function that causes a value held in a register to be unchanged even when a program runs

away. The following is an overview of the protect function:

(1) Registers affected by the protect function

The registers affected by the protect function are:

(a) System clock control registers 0, 1 (addresses 000616 and 000716)

(b) Processor mode registers 0, 1 (addresses 000416 and 000516)

The values in registers (a) through (c) cannot be changed in write-protect state. To change values in

the registers, put the individual registers in write-enabled state.

(2) Protect register

Figure 2.1.1 shows protect register.

2.1 Protect

Figure 2.1.1. Protect register

Protect register

Symbol

Address

When reset

PRCR

000A16

XXXXX0002

Bit name

Bit symbol

b2 b1

0 : Write-inhibited

1 : Write-enabled

PRC1

PRC0

Function

Nothing is assigned.

When write, set “0”. When read, their contents are indeterminate.

Enables writing to system clock

control registers 0 and 1 (addresses

000616 and 000716) and frequency

synthesizer registers (addresses

03DB16 to 03DF16)

Enables writing to processor mode

registers 0 and 1 (addresses 000416

and 000516)

Reserved

Must always be set to “0”

0 : Write-inhibited

1 : Write-enabled

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