HD404328 Datasheet, PDF (35/96 Pages) Hitachi Semiconductor – 4 BIT SINGLE CHIP MICROCOMPUTER

HD404328 Series
Interrupt
strobe
STOP/SBY
execution
Subactive mode
Internal execution
time
(LSON = 0, DTON = 1)
Oscillation
stabilization
time
Direct transfer
timing
T
t _RC
Active mode
T: Interrupt frame length
t_RC: Oscillation stabilization period
Figure 15 Direct Transfer Timing
MCU Operation Sequence: The MCU operates in the sequence shown in figures 16 to 18. It is reset by
an asynchronous RESET input, regardless of its state.
The low-power mode operation sequence is shown in figure 18. With the IE flag cleared and an interrupt
flag set together with its interrupt mask cleared, if a STOP/SBY instruction is executed, the instruction is
cancelled (regarded as an NOP) and the following instruction is executed. Before executing a STOP/SBY
instruction, make sure all interrupt flags are cleared or all interrupts are masked.
Power on
No
RESET = 1?
Yes
Reset MCU
MCU operation
cycle
Figure 16 MCU Operating Sequence (Power On)
33