HD643303x Hitachi, HD643303x Datasheet - Page 429
HD643303x
Manufacturer Part Number
HD643303x
Description
Hitachi Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD643303X.pdf
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16.3 Sleep Mode
16.3.1 Transition to Sleep Mode
When the SSBY bit is cleared to 0 in the system control register (SYSCR), execution of the
SLEEP instruction causes a transition from the program execution state to sleep mode.
Immediately after executing the SLEEP instruction the CPU halts, but the contents of its internal
registers are retained. The on-chip supporting modules do not halt in sleep mode.
16.3.2 Exit from Sleep Mode
Sleep mode is exited by an interrupt, or by input at the RES or STBY pin.
Exit by Interrupt: An interrupt terminates sleep mode and causes a transition to the interrupt
exception handling state. Sleep mode is not exited by an interrupt source in an on-chip supporting
module if the interrupt is disabled in the on-chip supporting module. Sleep mode is not exited by
an NMI interrupt if masked in the CPU.
Exit by RES Input: Low input at the RES pin exits from sleep mode to the reset state.
Exit by STBY Input: Low input at the STBY pin exits from sleep mode to hardware standby
mode.
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