M32C83T datasheet(111/527 Pages) RENESAS

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Page 88

9. Protection

)

(

Symbol

Address

After Reset

PRCR

000A16

XXXX 00002

NOTES:

1. The PRC2 bit can be set to "0" by writing to a desired address after the PRC2 bit is set to "1".

The PRC0, PRC1 and PRC3 bits are not automatically set to "0". Set to"0" by program.

Protect Register

PRC0

PRC1

PRC2

Protect Bit 0

Protect Bit 1

Protect Bit 2(1)

Protect Bit 3

PRC3

(b7 - b4)

Nothing is assigned. When write, set to "0".

When read, its content is indeterminate.

Function

Bit Name

Bit

Symbol

Enables writing to PLV, VDC0 and

VDC1 registers

0 : Write disable

1 : Write enable

Enables writing to CM0, CM1, CM2,

MCD, PLC0, PLC1 registers

0 : Write disable

1 : Write enable

Enables writing to PM0, PM1, INVC0,

INVC1 registers

0 : Write disable

1 : Write enable

Enables writing to PD9, PS3 registers

0 : Write disable

1 : Write enable

9. Protection

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

control.

Figure 9.1 shows the PRCR register. Each bit in the PRCR register protects the following registers:

• The PRC0 bit protects the CM0, CM1, CM2, MCD, PLC0 and PLC1 registers;

• The PRC1 bit protects the PM0, PM1, PM2, INVC0 and INVC1 registers;

• The PRC2 bit protects the PD9 and PS3 registers;

• The PRC3 bit protects the PLV and VDC0 registers.

The PRC2 bit is set to "0" (write disable) when data is written to a desired address after setting the PRC2 bit

to "1" (write enable). Set the PD9 and PS3 registers immediately after setting the PRC2 bit in the PRCR

to the PRC2 bit to "1" and the following instruction. The PRC0, PRC1 and PRC3 bits are not set to "0" even

if data is written to desired addresses. Set the PRC0, PRC1 and PRC3 bits to "0" by program.

Figure 9.1 PRCR Register

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