HD64F3644PV Datasheet, PDF (168/551 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 6 ROM
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
fOSC = 16 MHz fOSC = 10 MHz fOSC = 8 MHz fOSC = 2 MHz
Operating Frequency
φ = 8 MHz
φ = 5 MHz φ = 4 MHz φ = 1 MHz
Meaning of Variable
Counter Set
Set Time Value
Counter Set Counter Set Counter Set
Value
Value
Value
a (φ) Programming time 15.8 µs H'000F
(initial set value)
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 6.25 ms H'0C34
set value)
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.
a (φ) to d (φ) = ^{Operating frequency φ [MHz]} × a (φ = 5) to d (φ = 5)
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Rev. 6.00 Sep 12, 2006 page 146 of 526
REJ09B0326-0600