Usage Notes - Hitachi H8/3062 Hardware Manual

20.5.3

Usage Notes

The DIVCR setting changes the φ frequency, so note the following points.
• Select a frequency division ratio that stays within the assured operation range specified for the
clock cycle time t
operating frequency range. Ensure that ø is not below this lower limit.
Table 20.5 shows the operating frequency ranges of the various models in the H8/3062 Series.
Table 20.5 Comparison of H8/3062 Series Operating Frequency Ranges
Guaranteed 4.5 to 5.5 V
operating
frequency range
3.0 to 5.5 V
2.7 to 5.5 V
Crystal oscillation range
• All on-chip module operations are based on φ. Note that the timing of timer operations, serial
communication, and other time-dependent processing differs before and after any change in the
division ratio. The waiting time for exit from software standby mode also changes when the
division ratio is changed. For details, see section 21.4.3, Selection of Waiting Time for Exit
from Software Standby Mode.
626
in the AC electrical characteristics. Note that ø
cyc
H8/3062
F-ZTAT
H8/3062 R-Mask
F-ZTAT Version
1 to 20 1 to 20
MHz MHz
— 1 to 13
MHz
— —
2 to 20 2 to 20
MHz MHz
H8/3062 H8/3062
F-ZTAT Mask
A-Mask ROM
Version Version
2 to 25 1 to 20
MHz MHz
TBD 1 to 13
MHz
— 1 to 10
MHz
2 to 25 2 to 20
MHz MHz
= lower limit of the
min
H8/3061 H8/3060
Mask Mask
ROM ROM
Version Version
1 to 20 1 to 20
MHz MHz
1 to 13 1 to 13
MHz MHz
1 to 10 1 to 10
MHz MHz
2 to 20 2 to 20
MHz MHz
H8/3064
F-ZTAT
2 to 25
MHz
TBD
—
2 to 25
MHz