406
User’s Manual U15798EJ2V0UD
CHAPTER 20 STANDBY FUNCTION
20.1 Standby Function and Configuration
20.1.1 Standby function
The standby function is designed to reduce power consumption of the system. The following two modes are
available.
(1) HALT mode
HALT instruction execution sets the HALT mode. The HALT mode is intended to stop the CPU operation clock.
The system clock oscillator continues oscillating. In this mode, power consumption is not reduced as much as
in the STOP mode. However, the HALT mode is effective to restart operation immediately upon interrupt request
and to carry out intermittent operations such as watch applications.
(2) STOP mode
STOP instruction execution sets the STOP mode. In the STOP mode, the main system clock oscillator stops,
stopping the whole system, thereby considerably reducing the CPU power consumption.
Data memory low-voltage hold (down to V
DD
= 1.6 V) is possible. Thus, the STOP mode is effective to hold data
memory contents with ultra-low power consumption.
Because this mode can be cleared upon interrupt request, it enables intermittent operations to be carried out.
However, because a wait time is required to secure the oscillation stabilization time after the STOP mode is
released, select the HALT mode if it is necessary to start processing immediately upon interrupt request.
In either of these two modes, all the contents of registers, flags and data memory just before the standby mode
is set are held. The I/O port output latch and output buffer statuses are also held.
Cautions 1. The STOP mode can be used only when the system operates with the main system clock
(subsystem clock oscillation cannot be stopped). The HALT mode can be used with either
the main system clock or the subsystem clock.
2. When operation is transferred to the STOP mode, be sure to stop the operation of the
peripheral hardware that operates on the main system clock and execute the STOP instruc-
tion.
3. The following sequence is recommended for power consumption reduction of the A/D
converter when the standby function is used: First clear bit 7 (ADCS0) of A/D converter mode
register 0 (ADM0) to 0 to stop the A/D conversion operation, and then execute the HALT or
STOP instruction.
Содержание mPD780344 Series
Страница 2: ...2 User s Manual U15798EJ2V0UD MEMO...