UPD75402ACT datasheet(22/48 Pages) NEC

22 / 48 page

µPD75402A(A)

STANDBY FUNCTION

To reduce the power consumption when the program is in the wait state, the

µPD75402A(A) has two standby

modes, STOP and HALT.

Table 7-1 Operation Statuses in the Standby Mode

Instruction to be used to

set mode

Clock generator

Basic interval

timer

Serial interface

Clock output

circuit

External

interrupt

CPU

Release signal

HALT mode

HALT instruction

Only the CPU clock (

Φ) stops, but

oscillation continues.

Operates. (IRQBT is set at every refer-

ence time interval.)

Operable

Clocks other than CPU clock (

Φ) can be

output.

INT2 pin is usable.

INT0 pin cannot be used.

RESET input or interrupt request signals

enabled by the interrupt enable flags

STOP mode

STOP instruction

Oscillation of the system clock stops.

Operation stops.

Operable only when the external SCK

input is selected for the serial clock.

Operation stops.

INT2 pin is usable.

INT0 pin cannot be used.

Operation stops.

RESET input

Opera-

tion

status

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