Renesas RL78 Series User Manual

RL78/F13, F14 CHAPTER 29 OPTION BYTE
R01UH0368EJ0210 Rev.2.10 1617
Dec 10, 2015
29.2 Format of User Option Byte
The format of user option byte is shown below.
Figure 29-1. Format of User Option Byte (000C0H/020C0H)
Address: 000C0H/020C0H
Note 1
After reset:  (user setting value
Note 2
)
7 6 5 4 3 2 1 0
WDTINT WINDOW1 WINDOW0 WDTON WDCS2 WDCS1 WDCS0 WDSTBYON
WDTINT Use of interval interrupt of watchdog timer
0 Interval interrupt is not used.
1 Interval interrupt is generated when 75% + 1/2 fWDT of the overflow time is reached.
WINDOW1 WINDOW0 Watchdog timer window open period
Note 3
0 0 Setting prohibited
0 1 50%
1 0 75%
1 1 100%
WDTON Operation control of watchdog timer counter
0 Counter operation disabled (counting stopped after reset)
1 Counter operation enabled (counting started after reset)
WDCS2 WDCS1 WDCS0 Watchdog timer overflow time
(f
WDT = 17.25 kHz (MAX.))
0 0 0 2
6
/fWDT (3.71 ms)
0 0 1 2
7
/fWDT (7.42 ms)
0 1 0 2
8
/fWDT (14.84 ms)
0 1 1 2
9
/fWDT (29.68 ms)
1 0 0 2
11
/fWDT (118.72 ms)
1 0 1 2
13
/fWDT (474.90 ms)
1 1 0 2
14
/fWDT (949.80 ms)
1 1 1 2
16
/fWDT (3799.19 ms)
WDSTBYON Operation control of watchdog timer counter (HALT/STOP/SNOOZE mode)
0 Counter operation stopped in HALT/STOP/SNOOZE mode
Note 3
1 Counter operation enabled in HALT/STOP/SNOOZE mode
Notes 1. Set the same value as 000C0H to 020C0H when the boot swap operation is used because 000C0H is
replaced by 020C0H.
2. The setting at shipment of the user option byte is FFH.
3. The window open period is 100% when WDSTBYON = 0, regardless the value of the WINDOW1 and
WINDOW0 bits.
Caution The watchdog timer continues its operation during EEPROM emulation. During processing, the
interrupt acknowledge time is delayed. Set the overflow time and window open period taking this delay
into consideration.
Remarks 1. fWDT: Low-speed on-chip oscillator clock frequency
2. By specifying WDTON = 1, the invalid memory access detection function is always enabled regardless of
the setting for the IAWEN bit. (For details, see 27.3.8 Invalid memory access detection function.)

Renesas RL78 Series Specifications

General

Brand	Renesas
Model	RL78 Series
Category	Computer Hardware
Language	English