Renesas F-ZTAT H8/3642A Series, Hardware Manual, Page: 168 / 551

Section 6 ROM
Rev. 6.00 Sep 12, 2006 page 146 of 526
REJ09B0326-0600
Table 6.11 Set Values of #a, #b, #c, and #d for Typical Operating Frequencies when
Sample Program Is Executed in On-Chip Memory (RAM)
Oscillation Frequency
f
OSC
= 16 MHz f
OSC
= 10 MHz f
OSC
= 8 MHz f
OSC
= 2 MHz
Operating Frequency
φφφφ
= 8 MHz
φφφφ
= 5 MHz
φφφφ
= 4 MHz
φφφφ
= 1 MHz
Meaning of Variable
Set Time Counter Set
Value Counter Set
Value Counter Set
Value Counter Set
Value
a (
φ
) Programming time
(initial set value)
15.8 µs
H'000F H'0009 H'0007 H'0001
b (
φ
) tvs1 4 µs
H'06 H'04 H'03 H'01
c (
φ
) tvs2 2 µs
H'03 H'02 H'01 H'01
d (
φ
) Erase time (initial
set value)
6.25 ms
H'0C34 H'07A1 H'061A H'0186
Formula:
If an operating frequency other than those shown in table 6.11 is used, the values can be calculated
using the formula shown below. The calculation is based on an operating frequency (
φ
) of 5 MHz.
For a (
φ
) and d (
φ
), after decimal calculation, round down the first decimal place and convert to
hexadecimal so that a (
φ
) and d (
φ
) are 15.8 µs or less and 6.25 ms or less, respectively.
For b (
φ
) and c (
φ
), after decimal calculation, round up the first decimal place and convert to
hexadecimal so that b (
φ
) and c (
φ
) are 4 µs or more and 2 µs or more, respectively.
Operating frequency
φ
[MHz]
5
a (
φ
) to d (
φ
) =
×
a (
φ
= 5) to d (
φ
= 5)