R8CSLASH20 datasheet(102/501 Pages) RENESAS

102 / 501 page

R8C/20 Group, R8C/21 Group

11. Protection

Rev.2.00 Aug 27, 2008

Page 86 of 458

REJ09B0250-0200

11. Protection

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

Figure 11.1 shows the PRCR Register. The following lists the registers protected by the PRCR register.

• Registers protected by PRC0 bit: CM0, CM1, OCD, FRA0, FRA1 and FRA2 registers

• Registers protected by PRC1 bit: PM0 and PM1 registers

• Registers protected by PRC2 bit: PD0 register

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

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 w riting to any address.

Since the other bits are not set to 0, set to 0 by a program.

—

(b7-b6)

Reserved bits

When read, the content is 0.

—

(b5-b4)

Reserved bits

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 b5 b4 b3 b2 b1 b0

PRC0

PRC1

Protect bit 0

Writing to the CM0, CM, OCD, FRA0, FRA1 and

FRA2 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

PRC2

Protect bit 2

Writing to the PD0 register is enabled

0 : Disables w riting

1 : Enables w riting(1)

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