HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 615

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

Loop Counter Values in Programs and Watchdog Timer Overflow Interval Settings: The
values of a to h in the programs depend on the clock frequency. Table 18-14 indicates the values
for 10 MHz. Values for other frequencies can be calculated as shown below, but use the settings
in table 18-15 for the value off.
Table 18-14 Loop Counter Values in Program (10 MHz)
Clock Frequency
f = 10 MHz
Comments
Formula:
Examples for 16 MHz:
Table 18-15 Watchdog Timer Overflow Interval Settings
Clock Frequency
10 MHz ≤ frequency ≤ 16 MHz
2 MHz ≤ frequency < 10 MHz
1 MHz ≤ frequency < 2 MHz
Note:
a
a
b
c
d
e
g
h
(f)
(f)
(f)
(f)
(f)
(f)
(f)
(f)
including write time and erase time from start to stop of WDT operation. In this program
example, therefore, no more instructions should be added between the start and stop of
WDT operation.
The watchdog timer (WDT) set value is calculated based on the number of instructions
to h
=
=
=
=
=
=
=
(f)
16
10
16
10
16
10
16
10
16
10
16
10
16
10
Hexadecimal H'0019
Decimal
=
Clock frequency f [MHz]
947 = 1515.2
25 =
7 =
7 =
7 =
9 =
4 =
a
25
Program tVS1
10
(f)
11.2
11.2
11.2
14.4
6.4
40
b
H'0007
7
at write at pre-write
H'0028
H'000C
H'000C
H'05EC
H'000C
H'000F
H'0007
(f)
606
Variable
f
H'A57F
H'A57E
H'A57D
{a
c
H'0007
7
tVS2
(f = 10)
(f)
to h
(f = 10)
Variable
d
H'03B3 H'0007
947
Erase
(f)
}
e
7
tVS1
at erase
(f)
g
H'0009 H'0004
9
z
(f)
h
4
tVS2
(f)