HD6432621 Hitachi, HD6432621 Datasheet - Page 757

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x 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.
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.
21B.2.4 Timer Control/Status Register (TCSR)
Note: * Only write 0 to clear the flag.
TCSR is an 8-bit read/write register that selects the clock input to WDT1 TCNT and the mode.
Here, we describe bit 4. For details of the other bits in this register, see section 12.2.2, Timer
Control/Status Register (TCSR).
Bit
Initial value :
R/W
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.
:
:
R/(W)*
OVF
7
0
WT/IT
R/W
6
0
TME
R/W
5
0
PSS
R/W
4
0
RST/NMI
R/W
3
0
CKS2
R/W
2
0
CKS1
R/W
1
0
(Initial value)
(Initial value)
(Initial value)
CKS0
R/W
0
0
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