r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 1216

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 25 Power-Down Modes
25.5.6
The following points should be noted in clock division mode.
• Select the clock division ratio by the STC1 and STC0 bits so that the frequency of φ is within
• All the on-chip peripheral modules operate on the φ. Therefore, note that the time processing
• Note that the frequency of φ will be changed by changing the clock division ratio.
Rev. 1.00 Sep. 19, 2008 Page 1186 of 1342
REJ09B0467-0100
the operation guaranteed range of clock cycle time tcyc shown in the Electrical Characteristics.
In other words, the frequency of φ must be 8 MHz or higher; be careful not so specify φ < 8
MHz.
of modules such as a timer and SCI differ before and after changing the clock division ratio. In
addition, the wait time for clearing software standby mode differs by changing the clock
division ratio.
Notes on Clock Division Mode