HD404328 Datasheet, PDF (33/96 Pages) Hitachi Semiconductor – 4 BIT SINGLE CHIP MICROCOMPUTER

Active mode
Watch mode
HD404328 Series
Oscillation
stabilization period
Active mode
Interrupt strobe
INT₀
Interrupt request
generation
(During the transition
T
from watch mode to
active mode only)
T: Interrupt frame length
t_RC : Oscillation stabilization period
T
t_RC
T_X
Figure 13 Interrupt Frame
Miscellaneous register (MIS): $00C
3
2
1
0
Initial value: 0000,
R/W: W
t_RC selection
R1₂/SO PMOS off
Setting for switching
the system oscillator’s
frequency
MIS
T ^*1
Bit 1 Bit 0
t _RC^{* 1}
0.12207 ms
0 0 0.24414 ms
0.24414 ^*2 ms
0 1 15.625 ms _{7.8125 ms}
1 0 125 ms
62.5 ms
11
Not used
T: Interrupt frame length
t_RC: Oscillation stabilization period
Notes: 1. The value of t_RC applies only when
using a 32.768-kHz crystal oscillator.
2. Only direct transfer.
Figure 14 Miscellaneous Register
31