99
5.6
Subactive Mode
5.6.1
Transition to Subactive Mode
Subactive mode is entered from watch mode if a timer A, IRQ
0
, or WKP
0
to WKP
7
interrupt is
requested while the LSON bit in SYSCR1 is set to 1. From subsleep mode, subactive mode is
entered if a timer A, timer G, IRQ
0
to IRQ
4
, or WKP
0
to WKP
7
interrupt is requested. A transition
to subactive mode does not take place if the I bit of CCR is set to 1 or the particular interrupt is
disabled in the interrupt enable register.
The contents of SCI3, DTMF generator registers are reset.
5.6.2
Clearing Subactive Mode
Subactive mode is cleared by a SLEEP instruction or by a low input at the
RES
pin.
Clearing by SLEEP Instruction: If a SLEEP instruction is executed while the SSBY bit in
SYSCR1 is set to 1 and bit TMA3 in TMA is set to 1, subactive mode is cleared and watch mode
is entered. If a SLEEP instruction is executed while SSBY = 0 and LSON = 1 in SYSCR1 and
TMA3 = 1 in TMA, subsleep mode is entered. Direct transfer to active mode is also possible; see
5.8, Direct Transfer, below.
Clearing by
RES
Pin: Clearing by
RES
pin is the same as for standby mode; see 5.3.2, Clearing
Standby Mode.
5.6.3
Operating Frequency in Subactive Mode
The operating frequency in subactive mode is set in bits SA1 and SA0 in SYSCR2. The choices
are ø
W
/2, ø
W
/4, and ø
W
/8.