HD404328US View Datasheet(PDF) - Hitachi -> Renesas Electronics
Part Name
Description
Manufacturer
HD404328US Datasheet PDF : 94 Pages
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HD404328 Series
Reset
Standby mode
øOSC: Operating
fX: Operating
øCPU: Stopped
øCLK: fcyc
øPER: fcyc
SBY (standby)
Interrupt
øOSC: Operating
fX: Operating
øCPU: Stopped
øCLK: fSUB
øPER: f cyc
SBY (standby)
Interrupt
øOSC: Main oscillation frequency
fX: Suboscillation frequency,
for time-base
fcyc: fOSC/8
fSUB: fX/8
øCPU: System clock
øCLK: Clock for time-base
øPER: Clock for other peripheral
functions
LSON: Low speed on flag
DTON: Direct transfer on flag
Active mode
Stop mode
(TMA3 = 0)
øOSC: Operating
fX: Operating
øCPU: fcyc
øCLK: fcyc
øPER: fcyc
STOP
øOSC: Stopped
fX: Operating
øCPU: Stopped
øCLK: Stopped
øPER: Stopped
(TMA3 = 0)
Watch mode
(TMA3 = 1)
(TMA3 = 1, LSON = 0)
øOSC: Operating
fX: Operating
øCPU: f cyc
øCLK: fSUB
øPER: fcyc
*2
Subactive mode
øOSC: Stopped
fX: Operating
øCPU: fSUB
øCLK: fSUB
øPER: fSUB
STOP
INT0,
time-base*1
øOSC: Stopped
fX: Operating
øCPU: Stopped
øCLK: fSUB
øPER: Stopped
*3
STOP (TMA3 = 1, LSON = 1)
INT0,
time-base *1
STOP/SBY
(LSON = 1)*4
øOSC: Stopped
fX: Operating
øCPU: Stopped
øCLK: fSUB
øPER: Stopped
Notes: 1. Interrupt source
2. STOP/SBY (DTON = 1, LSON = 0)
3. STOP/SBY (DTON = 0, LSON = 0)
4. DTON can be 0 or 1.
Figure 10 MCU Status Transitions
Active Mode: The MCU operates according to the clock generated by the system oscillators OSC1 and
OSC2.
Standby Mode: The MCU enters standby mode when the SBY instruction is executed from active mode.
In this mode, the oscillators, interrupts, timer/counters, and serial interface continue to operate, but all
instruction execution-related clocks stop. The stopping of these clocks stops the CPU, retaining all RAM
and register contents and maintaining the current I/O pin status.
The standby mode is terminated by a RESET input or an interrupt request. If it is terminated by RESET
input, the MCU is reset as well. After an interrupt request, the MCU enters active mode and resumes,
executing the next instruction after the SBY instruction. If the interrupt enable flag is 1, that interrupt is
then processed; if it is 0, the interrupt request is left pending and normal instruction execution continues. A
flowchart of operation in standby mode is shown in figure 11.
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