HD404612FS datasheet(32/91 Pages) RENESAS

32 / 91 page

HD404618 Series

LSON and DTON. The DTON flag can only be set in subactive mode; it is automatically reset after a

transition to active mode.

Subactive mode is an optional function that the user must specify on the function option list.

Interrupt Frame: In watch and subactive modes, Ø

CLK is supplied for timer A and the INT0 circuit.

Prescaler W and timer A operate as time bases to generate interrupt frame timing. Three interrupt frame

cycles (T) can be selected by the settings of the miscellaneous register, as shown in figure 14.

In watch and subactive modes, timer A and

INT

0 interrupts are generated in synchronism with the interrupt

frame. An interrupt request is generated at the interrupt strobe timing, except when the MCU enters active

mode from watch mode. The

INT

0 falling edge is acknowledged regardless of the interrupt frame, but the

interrupt is executed simultaneously with the next interrupt strobe. Timer A generates an overflow and

interrupt request at the timing of an interrupt strobe.

t RC

MIS: $00C

MIS1

MIS0

MIS2

Refer to

table 20

selection

MIS

Bit 1

Bit 0

15.625 ms

0.24414 ms

62.5 ms

31.25 ms

0.24414 ms

7.8125 ms

0.12207 ms

Not used

400/800-kHz

ceramic oscillator

—

External clock input

Oscillation circuit

condition

Notes: 1.

The value of t

applies only when using a 32.768-kHz oscillator.

Only direct transfer.

Figure 14 Miscellaneous Register

Direct Transfer: By controlling the DTON, the MCU would be placed directly from subactive to active

mode. The detailed procedure is as follows:

• Set the DTON flag in subactive mode while LSON = 0.

• Execute the STOP or SBY instruction.

• After the oscillation stabilization time (a fixed value), the MCU will move automatically from subactive

to active mode.

Note that DTON ($020, bit 3) is valid only in subactive mode. When the MCU is in active mode, this flag

is always at reset.

The transition time (t

D) from subactive to active mode is tRC < tD < T + tRC.

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