D17133CS datasheet(183/289 Pages) NEC

183 / 289 page

CHAPTER 15

STANDBY FUNCTIONS

168

Figure 15-2. Cancellation of STOP Mode

(a)

STOP cancellation by RESET input

(b)

STOP cancellation by IRQ

××× (if DI)

(c)

STOP cancellation by IRQ

××× (if EI)

Execution of the

STOP instruction

TM count up

RESET

Operation

mode

STOP mode

System reset state

WAIT b

Operation mode

(Start of address 0)

WAIT b: This refers to the wait time until TM counts the divide-by-256 clock up to 256.

256

× 256/fX+α (when approximately 32 ms+α and fX=2MHz)

α: Oscillation growth time (Varies depending on the resonator)

Execution of the

STOP instruction

TM count up

IPQ

×××

Operation

mode

STOP mode

WAIT c

Operation mode

WAIT c: This refers to the wait time until TM counts the divide-by-m clock up to (n+1).

(n+1)

× m/fX+α (n and m: values immediately before the system is placed in STOP mode)

α: Oscillation growth time (Varies depending on the resonator)

Execution of the

STOP instruction

Interrupt operation acceptance, TM count up

IPQ

×××

Operation

mode

STOP mode

WAIT c

Operation mode

WAIT c: This refers to the wait time until TM counts the divide-by-m clock up to (n+1).

(n+1)

× m/fX+α (n and m: values immediately before the system is placed in STOP mode)

α: Oscillation growth time (Varies depending on the resonator)

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