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HD404612FS Datasheet(PDF) 30 Page - Renesas Technology Corp

Part # HD404612FS
Description  4-Bit Single-Chip Microcomputer
PDF  91 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404612FS Datasheet(HTML) 30 Page - Renesas Technology Corp

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HD404618 Series
28
Standby
Oscillator: Active
Peripheral clocks:
Active
All other clocks:
Stopped
RESET
= 1 ?
No
Yes
IF0 =
1 ?
No
Yes
IM0 =
0 ?
IF1 =
1 ?
No
Yes
IM1 =
0 ?
IFTA =
1 ?
No
Yes
IMTA =
0 ?
IFTB =
1 ?
No
Yes
IMTB =
0 ?
IFTC =
1 ?
No
Yes
IMTC =
0 ?
IFS =
1 ?
No
Yes
IMS =
0 ?
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
(SBY only)
(SBY only)
(SBY only)
(SBY only)
Watch
Oscillator: Stopped
Sub-oscillator: Active
Peripheral clocks: Stopped
All other clocks: Stopped
Restart
processor clocks
Reset MCU
Execute
next instruction
Accept
interrupt
Execute
next instruction
(active mode)
Restart
processor clocks
No
Yes
IF = 1,
IM = 0, and
IE = 1 ?
Figure 11 MCU Operation Flowchart in Watch and Standby Modes
Stop Mode: The MCU enters stop mode if the STOP instruction is executed in active mode when TMA3 =
0. In this mode, the system oscillator stops, which stops all MCU functions as well.
Stop mode is terminated by a RESET input as shown in figure 12. RESET must be high for at least one t
RC
to stabilize oscillation (refer to the AC Characteristics section). When the MCU restarts after stop mode is
cancelled, all RAM contents are retained, but the accuracy of the contents of the accumulator, B register, W
register, X/SPX register, Y/SPY register, carry flag, and serial data register cannot be guaranteed.



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