
HD404849 Series
34
Active mode
Watch mode
Active mode
Oscillation
stabilization period
Interrupt strobe
INT
Interrupt request
generation
(During the transition
from watch mode to
active mode only)
0
T
T
t
RC
Tx
T:
t :
Interrupt frame length
Oscillation stabilization period
Figure 17 Interrupt Frame
Bit
Initial value
Read/Write
Bit name
3
0
W
MIS3
2
0
W
MIS2
0
0
W
MIS0
1
0
W
MIS1
Miscellaneous register (MIS: $00C)
MIS1
0
MIS0
T
*
0
0.24414 ms
t
RC
0.12207 ms
0.24414 ms
7.8125 ms
31.25 ms
Oscillation circuit conditions
External clock input
Ceramic oscillator
Crystal oscillator
0
1
1
1
0
1
15.625 ms
62.5 ms
Not used
—
Notes: 1.
2.
The values of T and t
RC
are applied when a 32.768-kHz crystal oscillator is used.
The value is applied only when direct transfer operation is used.
Buffer control.
Refer to figure 38.
MIS3
MIS2
1
*
1
*
2
Figure 18 Miscellaneous Register (MIS)
Subactive Mode:
The OSC
1
and OSC
2
oscillator stops and the MCU operates with a clock generated by
the X1 and X2 oscillator. In this mode, functions except the A/D conversion operate. However, because
the operating clock slows down, power dissipation is reduced, next least to watch mode.