R8C2K datasheet(113/471 Pages) RENESAS

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R8C/2K Group, R8C/2L Group

11. Protection

Rev.1.10

Dec 21, 2007

Page 96 of 450

REJ09B0406-0110

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, FRA0, FRA1, and FRA2

• Registers protected by PRC1 bit: Registers PM0 and PM1

• Registers protected by PRC2 bit: PD0 register

• Registers protected by PRC3 bit: Registers VCA2, VW0C, VW1C, and VW2C

Figure 11.1

PRCR Register

Protect Register

Symbol

Address

After Reset

PRCR

000Ah

00h

Bit Symbol

Bit Name

Function

NOTE:

1. This bit is set to 0 after w riting 1 to the PRC2 bit and executing a w rite to any address. Since the other bits are not

set to 0, set them to 0 by a program.

PRC2

Protect bit 2

Writing to the PD0 register is enabled.

0 : Disables w riting

1 : Enables w riting(1)

—

(b5-b4)

Reserved bits

Set to 0.

PRC0

PRC1

Protect bit 0

Writing to registers CM0, CM1, OCD, FRA0, FRA1,

and FRA2 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

PRC3

Protect bit 3

Writing to registers VCA2, VW0C, 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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