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SH7014 Datasheet(PDF) 591 Page - Renesas Technology Corp

Part # SH7014
Description  32-Bit RISC Microcomputer
PDF  754 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7014 Datasheet(HTML) 591 Page - Renesas Technology Corp

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21. Power-Down State
Rev.5.00 Sep. 27, 2007 Page 557 of 716
REJ09B0398-0500
21.4.3
Standby Mode Application Example
This example describes a transition to standby mode on the falling edge of an NMI signal, and a
cancellation on the rising edge of the NMI signal. The timing is shown in figure 21.1.
When the NMI pin is changed from high to low level while the NMI edge select bit (NMIE) of the
ICR is set to 0 (falling edge detection), the NMI interrupt is accepted. When the NMIE bit is set to
1 (rising edge detection) by an NMI exception service routine, the standby bit (SBY) of the
SBYCR is set to 1, and a SLEEP instruction is executed, standby mode is entered. Thereafter,
standby mode is canceled when the NMI pin is changed from low to high level.
Oscillator
CK
NMI
NMIE
SBY
NMI
exception
processing
Exception
service
routine
SBY = 1
SLEEP
instruction
Standby
mode
Oscillation
start
time
WDT
time
set
NMI
exception
processing
Oscillation
settling time
Figure 21.1 Standby Mode NMI Timing (Application Example)



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