R8C2K datasheet(143/471 Pages) RENESAS

143 / 471 page

R8C/2K Group, R8C/2L Group

14. Option Function Select Area

Rev.1.10

Dec 21, 2007

Page 126 of 450

REJ09B0406-0110

14.2

OFS Register

The OFS register is used to select the MCU state after reset or the function to prevent rewriting in parallel I/O

mode. Figure 14.2 shows the OFS Register.

Figure 14.2

OFS Register

Option Function Select Register

(1)

Symbol

Address

When Shipping

OFS

0FFFFh

FFh(3)

Bit Symbol

Bit Name

Function

NOTES:

The OFS register is on the flash memory. Write to the OFS register w ith a program. After w riting is completed, do not

w rite additions to the OFS register.

LVD0ON

Voltage detection 0

circuit start bit(2)

0 : Voltage monitor 0 reset enabled after hardw are

reset

1 : Voltage monitor 0 reset disabled after hardw are

reset

—

(b4)

Reserved bit

Set to 1.

b3 b2 b1 b0

b7 b6 b5 b4

WDTON

Watchdog timer start

select bit

0 : Starts w atchdog timer automatically after reset

1 : Watchdog timer is inactive after reset

—

(b1)

Reserved bit

Set to 1.

ROMCR

ROM code protect

disabled bit

0 : ROM code protect disabled

1 : ROMCP1 enabled

ROMCP1

ROM code protect bit

0 : ROM code protect enabled

1 : ROM code protect disabled

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

—

(b6)

Reserved bit

Set to 1.

CSPROINI

Count source protect

mode after reset select

bit

0 : Count source protect mode enabled after reset

1 : Count source protect mode disabled after reset

Setting the LVD0ON bit is only valid after a hardw are reset. To use the pow er-on reset, set the LVD0ON bit to 0

(voltage monitor 0 reset enabled after hardw are reset).

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