Renesas M16C/50 Series User Manual page 101

M16C/5L Group, M16C/56 Group
6.3 Optional Function Select Area
In the optional function select area, the MCU state after reset and the function to prevent rewrite in parallel
I/O mode are selected.
The optional function select area is not an SFR, and therefore cannot be rewritten by a program. Set an
appropriate value when writing a program to flash memory. The entire optional function select area
becomes FFh when the block including the optional function select area is erased.
In blank products, the OFS1 address value is FFh when shipped. After a value is written by the user, this
address takes on the written value. In programmed products, the OFS1 address is the value set in the
user program prior to shipping.
6.3.1 Optional Function Select Address 1 (OFS1)
Optional Function Select Address 1
b7 b6 b5 b4 b3 b2
0 1
WDTON (Watchdog timer start select bit) (b0)
CSPROINI (After-reset count source protection mode select bit) (b7)
These bits select the state of the watchdog timer after reset.
Set the WDTON bit to 0 (watchdog timer starts automatically after reset) when setting the CSPROINI bit
to 0 (count source protection mode enabled after reset).
Refer to 13. "Watchdog Timer" for details on the watchdog timer and count source protection mode.
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
b1 b0 Symbol
1
OFS1
Bit Symbol
WDTON Watchdog timer start select bit
—
Reserved bit
(b1)
ROMCR ROM code protect cancel bit
ROMCP1 ROM code protect bit
—
Reserved bit
(b4)
—
Reserved bit
(b5)
LVDAS Voltage detector 0 start bit
After-reset count source
CSPROINI
protection mode select bit
Address
FFFFFh
Bit Name
0 : Watchdog timer starts automatically
after reset.
1 : Watchdog timer is in a stopped state
after reset.
Set to 1.
0 : ROM code protection cancelled.
1 : ROMCP1 bit enabled.
0 : ROM code protection enabled.
1 : ROM code protection cancelled.
Set to 1.
Set to 0.
0 : Voltage monitor 0 reset enabled
after hardware reset.
1 : Voltage monitor 0 reset disabled
after hardware reset.
0 : Count source protection mode
enabled after reset.
1 : Count source protection mode
disabled after reset.
6. Resets
Function
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