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HD404816FS Datasheet(PDF) 28 Page - Renesas Technology Corp

Part # HD404816FS
Description  4-Bit Single-Chip Microcomputer
PDF  100 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404816FS Datasheet(HTML) 28 Page - Renesas Technology Corp

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HD404818 Series
26
Operating Modes
The MCU has five operating modes that are specified by how the clock is used. The functions available in
each mode are listed in table 15, and operations are shown in table 16. Transitions between operating
modes are shown in figure 9.
Table 16 provides additional information for table 26.
Table 15 Functions Available in Each Operating Mode
Mode Name
Active
Standby
Stop
Watch
Subactive*
4
Activation method
RESET
cancellation,
interrupt
request
SBY
instruction
TMA3 = 0,
STOP
instruction
TMA3 = 1,
STOP
instruction
INT
0 or timer A
interrupt
request from
watch mode
Status
System oscillator
OP
OP
Stopped
Stopped
Stopped
Subsystem oscillator OP
OP
OP *1
OP
OP
Instruction execution
(ø
CPU)
OP
Stopped
Stopped
Stopped
OP
Peripheral function,
interrupt (ø
PER)
OP
OP
Stopped
Stopped
OP
Clock function,
interrupt (ø
CLK)
OP
OP
Stopped
OP *2
OP *2
RAM
OP
Retained
Retained
Retained
OP
Registers/flags
OP
Retained
Reset
Retained
OP
I/O
OP
Retained
High
impedance*
3
Retained*
3
OP *3
Cancellation method
RESET input,
STOP/SBY
instruction
RESET input,
interrupt
request
RESET input
RESET input,
INT
0 or timer A
interrupt
request
RESET input,
STOP/SBY
instruction
Notes: OP indicates operating.
1. To reduce current dissipation, stop all oscillation in external circuits.
2. Refer to the Interrupt Frame section for details.
3. Refer to interrupt frame.
4. Subactive mode is an optional function to be specified on the function option list.
5. In the watch and subactive modes, the MCU requires a 32.768-kHz crystal oscillator.



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