h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 777

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Bit 5—Noise Elimination Sampling Frequency Select (NESEL): This bit selects the sampling
frequency of the subclock (φSUB) generated by the subclock oscillator is sampled by the clock (φ)
generated by the system clock oscillator. Set this bit to 0 when φ = 5 MHz or more. This setting is
disabled in subactive mode, subsleep mode, and watch mode.
Bit 4—Subclock enable (SUBSTP): This bit enables/disables subclock generation.
Bit 3—Oscillation Circuit Feedback Resistance Control Bit (RFCUT): This bit turns the
internal feedback resistance of the main clock oscillation circuit ON/OFF.
Bit 2—Reserved: Only write 0 to this bit.
Bit 5
NESEL
0
1
Bit 4
SUBSTP Description
0
1
Bit 3
RFCUT
0
1
Description
Sampling using 1/32 ×φ
Sampling using 1/4 ×φ
Enables subclock generation
Disables subclock generation
Description
When the main clock is oscillating, sets the feedback resistance ON. When the main
clock is stopped, sets the feedback resistance OFF.
Sets the feedback resistance OFF.
Rev. 5.00 Sep 22, 2005 page 751 of 1136
Section 22 Power-Down Modes
REJ09B0257-0500
(Initial value)
(Initial value)
(Initial value)