HD6433045 HITACHI [Hitachi Semiconductor], HD6433045 Datasheet - Page 649

• Manufacturer Part Number: HD6433045
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: HITACHI [Hitachi Semiconductor]

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)