HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 649
HD6433044
Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6433044.pdf
(867 pages)
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Bits 7 to 2—Reserved: Read-only bits, always read as 1.
Bits 1 and 0—Divide (DIV1 and DIV0): These bits select the frequency division ratio, as follows.
Bit 1
DIV1
0
0
1
1
19.5.3 Usage Notes
The DIVCR setting changes the ø 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
settings that give system clock frequencies less than 1 MHz.
All on-chip module operations are based on ø. 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 20.4.3, Selection of Waiting Time for
Exit from Software Standby Mode.
Bit 0
DIV0
0
1
0
1
Frequency Division Ratio
1/1
1/2
1/4
1/8
cyc
in the AC electrical characteristics. Note that ø
640
MIN
= 1 MHz. Avoid
(Initial value)
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