HD6432646 Hitachi, HD6432646 Datasheet - Page 769

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Bit 5—Noise Elimination Sampling Frequency Select (NESEL): This bit selects the sampling
frequency of the subclock (øSUB) generated by the subclock oscillator is sampled by the clock (ø)
generated by the system clock oscillator. Set this bit to 0 when ø=5MHz or more. This setting is
disabled in sub-active mode, sub-sleep mode, and watch mode.
Bit 5
NESEL
0
1
Bit 4—Subclock enable (SUBSTP): This bit enables/disables subclock generation.
Bit 4
SUBSTP Description
0
1
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 3
RFCUT
0
1
Bit 2—Reserved: Only write 0 to this bit.
Description
Sampling using 1/32 xø
Sampling using 1/4 xø
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.
(Initial value)
(Initial value)
(Initial value)
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