HD404816FS datasheet(32/100 Pages) RENESAS

32 / 100 page

HD404818 Series

Stop Mode: The MCU enters stop mode if the STOP instruction is executed in active mode when TMA3 =

0. In this mode, the system oscillator stops, which stops all MCU functions as well.

Stop mode is terminated by a RESET input as shown in figure 11. RESET must be high for at least one t

to stabilize oscillation (refer to the AC Characteristics section). When the MCU restarts after stop mode is

cancelled, all RAM contents are retained, but the accuracy of the contents of the accumulator, B register, W

Stop mode

Oscillator

Internal clock

RESET

STOP instruction execution

(stabilization time)

t res

res ≥

Figure 11 Timing of Stop Mode Cancellation

Watch Mode: The MCU enters watch mode if the STOP instruction is executed in active mode when

TMA3 = 1, or if the STOP or SBY instruction is executed in subactive mode.

Watch mode is terminated by a RESET input or a timer-A/

INT

0 interrupt request. For details on RESET

input, refer to the Stop Mode section. When terminated by a timer-A/

INT

0 interrupt request, the MCU

enters active mode if LSON is 0, or subactive mode if LSON is 1. After an interrupt request is generated,

the time required to enter active mode is t

RC for a timer A interrupt, and TX (where T + tRC ≤ TX ≤ 2T + tRC)

for an

INT

0 interrupt, as shown in figure 12.

Operation during mode transition is the same as that at standby mode cancellation (figure 10).

HD404816FS Datasheet(PDF) 32 Page - Renesas Technology Corp