HD404054 Datasheet, PDF (23/101 Pages) Hitachi Semiconductor – HMCS400-series microcomputers designed to increase program productivity with large-capacity memory

HD404054 Series/HD404094 Series
Operating Modes
The MCU has Three operating modes as shown in table 15. The operations in each mode are listed in
tables 16 and 17. Transitions between operating modes are shown in figure 11.
Table 15 Operating Modes and Clock Status
Mode Name
Active
Standby
Stop
Activation method
RESET cancellation, SBY instruction
interrupt request,
STOPC cancellation in
stop mode
STOP instruction
Status
System oscillator OP
OP
Stopped
Cancellation method
RESET input,
RESET input, interrupt RESET input, STOPC
STOP/SBY instruction request
input in stop mode
Note: OP implies in operation
Table 16 Operations in Low-Power Dissipation Modes
Function
Stop Mode
CPU
Reset
RAM
Retained
Timer A
Reset
Timer C
Reset
Timer D
Reset
Serial interface 1
Reset
Comparator
Reset
I/O
Reset*
Note: OP implies in operation
* Output pins are at high impedance.
Standby Mode
Retained
Retained
OP
OP
OP
OP
Stopped
Retained
Table 17 I/O Status in Low-Power Dissipation Modes
D₀–D₉
D₁₂, D₁₃, RC₀,
RD₀–RD₃, RE₀
R0–R4
Output
Standby Mode
Retained
—
Retained or output of
peripheral functions
Stop Mode
High impedance
—
High impedance
Input
Active Mode
Input enabled
Input enabled
Input enabled
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