R8C18 datasheet(86/257 Pages) RENESAS

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R8C/18 Group, R8C/19 Group

11. Protection

Rev.1.30

Apr 14, 2006

Page 71 of 233

REJ09B0222-0130

11. Protection

The protection function protects important registers from being easily overwritten when a program runs out

of control. Figure 11.1 shows the PRCR Register. The registers protected by the PRCR register are listed

below.

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

• Registers protected by PRC1 bit: Registers PM0 and PM1

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

Figure 11.1

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 registers CM0, CM, OCD, HRA0, HRA1,

and HRA2 is enabled.

0 : Disables w riting

1 : Enables w riting

Protect bit 1

Writing to registers PM0 and PM1 is enabled.

0 : Disables w riting

1 : Enables w riting

b3 b2 b1 b0

b7 b6 b5 b4

—

(b5-b4)

Reserved bits

Set to 0.

PRC3

Protect bit 3

Writing to registers VCA2, VW1C, and VW2C is

enabled.

0 : Disables w riting

1 : Enables w riting

—

(b7-b6)

Reserved bits

When read, the content is 0.

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