Rev. 1.0, 02/00, page 84 of 1141
4.8
Subsleep Mode
4.8.1
Subsleep Mode
If a SLEEP instruction is executed in subactive mode when the SSBY in SBYCR is cleared to 0,
the LSON bit in LPWRCR is set to 1, and the TMA3 bit in TMA (Timer A) is set to 1, the CPU
will make a transition to subsleep mode.
In this mode, the CPU and all on-chip supporting modules other than Timer A stop. As long as
the prescribed voltage is supplied, the contents of CPU registers, some on-chip supporting module
registers, and on-chip RAM, are retained, and I/O ports are placed in the high-impedance state.
4.8.2
Clearing Subsleep Mode
Subsleep mode is cleared by an interrupt (Timer A interrupt, or pin
,54
3
to
,54
8
), or by means
of the
5(6
pin.
Clearing with an Interrupt: When an interrupt request signal is input, subsleep mode is cleared
and interrupt exception handling is started. Subsleep mode cannot be cleared with an
,54
3
to
,54
8
interrupt if the corresponding enable bit has been cleared to 0, or with an on-chip supporting
module interrupt if acceptance of the relevant interrupt has been disabled by the interrupt enable
register or masked by the CPU.
Clearing with the
5(6
5(6
5(6
5(6
Pin: See (2) Clearing with the
5(6
Pin in section 4.6.2, Clearing Standby
Mode.