HD404828RFS datasheet(37/149 Pages) RENESAS

37 / 149 page

HD404829R Series

Subactive Mode: The OSC1 and OSC2 oscillator stops and the MCU operates with a clock generated by

the X1 and X2 oscillator. In this mode, functions except the A/D conversion operate. However, because

the operating clock is slow, the power dissipation becomes low, next to watch mode.

The CPU instruction execution speed can be selected as 244

µs or 122 µs by setting bit 2 (SSR2) of the

system clock select register (SSR: $029). Note that the SSR2 value must be changed in active mode. If the

value is changed in subactive mode, the MCU may malfunction.

When the STOP or SBY instruction is executed in subactive mode, the MCU enters either watch or active

mode, depending on the statuses of the low speed on flag (LSON: $020, bit 0) and the direct transfer on

flag (DTON: $020, bit 3).

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

Interrupt Frame: In watch and subactive modes,

CLK is applied to timer A and the INT0Icircuit.

Prescaler W and timer A operate as the time-base and generate the timing clock for the interrupt frame.

Three interrupt frame lengths (T) can be selected by setting the miscellaneous register (MIS: $00C) (figure

18).

In watch and subactive modes, the timer-A/

INT0 interrupt is generated synchronously with the interrupt

frame. The interrupt request is generated synchronously with the interrupt strobe timing except during

transition to active mode. The falling edge of the

INT0 signal is input asynchronously with the interrupt

frame timing, but it is regarded as input synchronously with the second interrupt strobe clock after the

falling edge. An overflow and interrupt request in timer A is generated synchronously with the interrupt

strobe timing.

tRC

Interrupt frame length

Oscillation stabilization period

(During the transition

from watch mode to

active mode only)

Interrupt strobe

INT0

Interrupt request

generation

Active mode

Watch mode

Active mode

Oscillation

stabilization period

If the time from the fall of the

INT0 signal until the interrrupt is accepted

and active mode is entered and is designated Tx, then Tx will be in the

following range:

T + tRC ≤ Tx ≤ 2T + tRC

Note:

Figure 17 Interrupt Frame

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