83
Bit 3—Noise Elimination Sampling Frequency Select (NESEL): This bit selects the frequency
at which the watch clock signal (ø
W
) generated by the subclock pulse generator is sampled, in
relation to the oscillator clock (ø
OSC
) generated by the system clock pulse generator. When ø
OSC
= 2
to 10 MHz, clear NESEL to 0.
Bit 3: NESEL
Description
0
Sampling rate is ø
OSC
/16
(Initial value)
1
Sampling rate is ø
OSC
/4
Bits 2 to 0—Reserved Bits: Bits 2 to 0 are reserved: they are always read as 0 and cannot be
modified.
6.2.2
System Control Register 2 (SYSCR2)
Bit
7
6
5
4
3
2
1
0
SMSEL
LSON
DTON
MA2
MA1
MA0
SA1
SA0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
SYSCR2 is an 8-bit read/write register for power-down mode control.
Upon reset, SYSCR2 is initialized to H'00.
Bit 7—Sleep Mode Selection (SMSEL): This bit chooses the transition to the sleep mode or
subsleep mode when the SLEEP instruction is executed. The transition after the SLEEP instruction
is executed depends on a combination of this and other control bits.
Bit 7: SMSEL
Description
0
A transition is made to sleep mode.
(Initial value)
1
A transition is made to subsleep mode.
Bit 6—Low Speed on Flag (LSON): This bit chooses the system clock (ø) or subclock (ø
SUB
) as
the CPU operating clock. The resulting operation mode after the SLEEP instruction is executed
depends on the combination of other control bits.
Bit 6: LSON
Description
0
The CPU operates on the system clock (ø)
(Initial value)
1
The CPU operates on the subclock (ø
SUB
)
Содержание H8/3660
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Страница 408: ...392 18 5 Output Load Circuit VCC 2 4 kΩ 12 kΩ 30 pF LSI output pin Figure 18 7 Output Load Condition ...
Страница 457: ...441 DEC VIN CH3 to CH0 A D converter Internal data bus Figure C 17 Port B Block Diagram PB7 to PB0 ...