Under development
Preliminary specification
Specifications in this manual are tentative and subject to change.
R8C/L35A Group, R8C/L36A Group, R8C/L38A Group, R8C/L3AA Group,
R8C/L35B Group, R8C/L36B Group, R8C/L38B Group, R8C/L3AB Group
6. Voltage Detection Circuit
6.2.9
Option Function Select Register (OFS)
b6
LVDAS
1
b5
b4
b3
b2
VDSEL1 VDSEL0 ROMCP1 ROMCR
1
1
1
1
b1
—
1
b0
WDTON
1
(Note 1)
R/W
R/W
R/W
R/W
R/W
Address 0FFFFh
Bit
b7
Symbol CSPROINI
When shipping
1
Bit
b0
b1
b2
b3
b4
b5
Symbol
Bit Name
WDTON Watchdog timer start select bit
—
Reserved bit
ROMCR ROM code protect disable bit
ROMCP1 ROM code protect bit
VDSEL0 Voltage detection 0 level select bit
(2)
VDSEL1
Function
0: Watchdog timer automatically starts after reset
1: Watchdog timer is stopped after reset
Set to 1.
0: ROM code protect disabled
1: ROMCP1 bit enabled
0: ROM code protect enabled
1: ROM code protect disabled
b5 b4
b6
b7
LVDAS
Voltage detection 0 circuit start bit
(3)
CSPROINI Count source protection mode
after reset select bit
R/W
0 0: 3.80 V selected (Vdet0_3)
R/W
0 1: 2.85 V selected (Vdet0_2)
1 0: 2.35 V selected (Vdet0_1)
1 1: 1.90 V selected (Vdet0_0)
0: Voltage monitor 0 reset enabled after reset
R/W
1: Voltage monitor 0 reset disabled after reset
0: Count source protection mode enabled after reset R/W
1: Count source protection mode disabled after reset
Notes:
1. If the block including the OFS register is erased, the OFS register value is set to FFh.
2. The same level of the voltage detection 0 level selected by bits VDSEL0 and VDESL1 is set in both functions of
voltage monitor 0 reset and power-on reset.
3. To use power-on reset, set the LVDAS bit to 0 (voltage monitor 0 reset enabled after reset).
The OFS register is allocated in the flash memory. Write to this register with a program.
After writing, do not write additions to this register.
LVDAS Bit (Voltage Detection 0 Circuit Start Bit)
The Vdet0 voltage to be monitored by the voltage detection 0 circuit is selected by bits VDSEL0 and VDSEL1.
REJ09B0441-0010 Rev.0.10
Page 71 of 809
Jul 30, 2008
RENESAS [ RENESAS TECHNOLOGY CORP ]
