HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 659
HD6433044
Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6433044.pdf
(867 pages)
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20.4.4 Sample Application of Software Standby Mode
Figure 20-1 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.
20.4.5 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.
Clock
oscillator
ø
NMI
NMIEG
SSBY
Figure 20-1 NMI Timing for Software Standby Mode (Example)
NMI interrupt
handler
NMIEG = 1
SSBY = 1
SLEEP
instruction
Software standby
mode (power-
down state)
650
Oscillator
settling time
(t
osc2
)
NMI exception
handling
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