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H8/3021 Datasheet(PDF) 544 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 544 Page - Renesas Technology Corp

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17. Power-Down State
Rev.2.00 Mar. 22, 2007 Page 520 of 684
REJ09B0352-0200
17.4.4
Sample Application of Software Standby Mode
Figure 17.1 shows an example in which software standby mode is entered at the fall of NMI and
exited at the rise of NMI.
With the NMI edge select bit (NMIEG) cleared to 0 in SYSCR (selecting the falling edge), an
NMI interrupt occurs. Next the NMIEG bit is set to 1 (selecting the rising edge) and the SSBY bit
is set to 1; then the SLEEP instruction is executed to enter software standby mode.
Software standby mode is exited at the next rising edge of the NMI signal .
φ
NMI
NMIEG
SSBY
NMI exception
handling
NMIEG = 1
SSBY = 1
Software standby
mode (power-
down state)
Oscillator
settling time
(t osc2)
SLEEP
instruction
NMI exception
handling
Clock
oscillator
Figure 17.1 NMI Timing for Software Standby Mode (Example)
17.4.5
Usage Note
The I/O ports retain their existing states in software standby mode. If a port is in the high output
state, its output current is not reduced.



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