R8CSLASH15 datasheet(208/277 Pages) RENESAS

208 / 277 page

R8C/14 Group, R8C/15 Group

18. Flash Memory Version

Rev.2.10

Jan 19, 2006

Page 196 of 253

REJ09B0164-0210

18.3.2

ROM Code Protect Function

The ROM code protect function disables to read and change the internal flash memory by the OFS

The ROM code protect function is enabled by writing “0” to the ROMCP1 bit and “1” to the ROMCR bit

and disables to read and change the internal flash memory. Once the ROM code protect is enabled,

the content in the internal flash memory cannot be rewritten in parallel I/O mode. To disable ROM

code protect, erase the block including the OFS register with CPU rewrite mode or standard serial I/O

mode.

Figure 18.4

OFS Register

Option Function Select Register

(1)

Symbol

Address

Before Shipment

OFS

0FFFFh

FFh(2)

Bit Symbol

Bit Name

Function

Reserved Bit

NOTES :

The OFS register is on the flash memory. Write to the OFS register w ith a program.

CSPROINI

Count Source Protect

Mode After Reset Select

Bit

0 : Count source protect mode after reset enabled

1 : Count source protect mode after reset disabled

—

(b6-b4)

Reserved Bit

Set to “1”

ROMCP1

ROM Code Protect Bit

0 : ROM code protect enabled

1 : ROM code protect disabled

ROMCR

ROM Code Protect

Disabled Bit

0 : ROM code protect disabled

1 : ROMCP1enabled

Set to “1”

WDTON

Watchdog Timer Start

Select Bit

0 : Starts w atchdog timer automatically after reset

1 : Watchdog timer is inactive after reset

—

(b1)

111

If the block including the OFS register is erased, “FFh” is set to the OFS register.

b7 b6 b5 b4 b3 b2 b1 b0

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