CHAPTER 26 OPTION BYTE
Page 800 of 920
Note 3.
When the window open period is set to 75%, clearing the counter of the watchdog timer (writing ACH to
WDTE) must proceed outside the corresponding period from among those listed below, over which clearing
of the counter is prohibited (for example, confirming that the interval timer interrupt request flag (WDTIIF) of
the watchdog timer is set).
Remark
f
IL
: Low-speed on-chip oscillator clock frequency
Figure 26 - 2 Format of User Option Byte (000C1H/010C1H) (1/4)
• LVD setting (interrupt & reset mode)
Note
Set the same value as 000C1H to 010C1H when the boot swap operation is used because 000C1H is
replaced by 010C1H.
Caution
Be sure to set bit 4 to “1”.
Remark 1.
For details on the LVD circuit, see
.
Remark 2.
The detection voltage is a typical value. For details, see
.
WDCS2
WDCS1
WDCS0
Watchdog timer overflow time
(f
IL
= 17.25 kHz (MAX.))
Period over which clearing the
counter is prohibited when the
window open period is set to 75%
0
0
0
2
6
/f
IL
(3.71 ms)
1.85 to 2.51 ms
0
0
1
2
7
/f
IL
(7.42 ms)
3.71 to 5.02 ms
0
1
0
2
8
/f
IL
(14.84 ms)
7.42 to 10.04 ms
0
1
1
2
9
/f
IL
(29.68 ms)
14.84 to 20.08 ms
1
0
0
2
11
/f
IL
(118.72 ms)
56.36 to 80.32 ms
1
0
1
2
13
/f
IL
(474.90 ms)
237.44 to 321.26 ms
1
1
0
2
14
/f
IL
(949.80 ms)
474.89 to 642.51 ms
1
1
1
2
16
/f
IL
(3799.19 ms)
1899.59 to 2570.04 ms
Address: 000C1H/010C1H
7
6
5
4
3
2
1
0
VPOC2
VPOC1
VPOC0
1
LVIS1
LVIS0
LVIMDS1
LVIMDS0
Detection Voltage
Option Byte Setting Value
V
LVDH
V
LVDL
VPOC2
VPOC1
VPOC0
LVIS1
LVIS0
Mode setting
Rising edge Falling edge Falling edge
LVIMDS1 LVIMDS0
1.98 V
1.94 V
1.84 V
0
0
1
1
0
1
0
2.09 V
2.04 V
0
1
3.13 V
3.06 V
0
0
2.61 V
2.55 V
2.45 V
1
0
1
0
2.71 V
2.65 V
0
1
2.92 V
2.86 V
2.75 V
1
1
1
0
3.02 V
2.96 V
0
1
—
Settings other than the above are prohibited
<R>
Содержание RL78/G1H
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