Renesas H8 Series Hardware Manual page 491

Section 14 Power-On Reset and Low-Voltage Detection Circuits (H8/38124 Group Only)
Resistance Value Calculation Table
Ex. No Vref (V)
1 1.30
2 1.41
3 1.57
4 2.09
4. Using an error calculation table like the one shown below, plug in values for R1, R2, R3, and
Vref to calculate the deviation of Vreset1, Vint(D), and Vint(U). Make sure to double check
the maximum and minimum values for each value.
Error Calculation Table
R1 R2
(kΩ Ω Ω Ω ) (kΩ Ω Ω Ω )
Vref (V)
1.3 517 33
R (kΩ Ω Ω Ω )
Vreset1
1000 2.5
1000 2.7
1000 3
1000 4
Resistance Value
Error (%)
R3
(kΩ Ω Ω Ω )
5
450 R1+Err, R2/R3-Err
R1-Err, R2/R3+Err
R1/R2/R3 No Err
R1/R2+Err, R3-Err
R1/R2-Err, R3+Err
Vint(D) Vint(U)
2.7 2.9
2.9 3
3.2 3.5
4.5 4.7
Comparator
Error (V)
0.1
0
-0.1
0.1
0
-0.1
0.1
0
-0.1
0.1
0
-0.1
0.1
0
-0.1
Rev. 7.00 Mar 10, 2005 page 449 of 652
R1 (kΩ Ω Ω Ω ) R2 (kΩ Ω Ω Ω )
517 33
514 16
511 42
536 20
Vreset1 Vint(D)
(V) (V)
2.59 2.94
2.49 2.84
2.39 2.74
2.59 2.66
2.49 2.56
2.39 2.46
2.59 2.79
2.49 2.69
2.39 2.59
2.59 2.93
2.49 2.83
2.39 2.73
2.59 2.67
2.49 2.57
2.39 2.47
REJ09B0042-0700
R3 (kΩ Ω Ω Ω )
450
470
447
444
Vint(U)
(V)
3.15
3.05
2.95
2.85
2.75
2.65
2.99
2.89
2.79
3.16
3.06
2.96
2.84
2.74
2.64