R8CSLASH15 datasheet(67/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

10. Protection

Rev.2.10

Jan 19, 2006

Page 55 of 253

REJ09B0164-0210

10. Protection

Protection function protects important registers from being easily overwritten when a program runs out of

control. Figure 10.1 shows the PRCR Register. The following lists the registers protected by the PRCR

• Registers protected by PRC0 bit : CM0, CM1, and OCD, HRA0, HRA1, HRA2 registers

• Registers protected by PRC1 bit : PM0 and PM1 registers

• Registers protected by PRC3 bit : VCA2, VW1C and VW2C registers

Figure 10.1

PRCR Register

Protect Register

Symbol

Address

After Reset

PRCR

000Ah

00h

Bit Symbol

Bit Name

Function

—

(b2)

Reserved Bit

Set to “0”

PRC0

PRC1

Protect Bit 0

Writing to the CM0, CM, OCD, HRA0, HRA1 and

HRA2 registers is enabled.

0 : Disables w riting

1 : Enables w riting

Protect Bit 1

Writing to the PM0 and PM1 registers is enabled.

0 : Disables w riting

1 : Enables w riting

b3 b2 b1 b0

b7 b6 b5 b4

—

(b5-b4)

Reserved Bit

Set to “0”

PRC3

Protect Bit 3

Writing to the VCA2, VW1C and VW2C registers is

enabled.

0 : Disables w riting

1 : Enables w riting

—

(b7-b6)

Reserved Bit

When read, its content is “0”.

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