UPD78F0411GA-GAM-AX Datasheet, PDF (458/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 19 STANDBY FUNCTION
19.1 Standby Function and Configuration
19.1.1 Standby function
The standby function is designed to reduce the operating current of the system. The following two modes are
available.
(1) HALT mode
HALT instruction execution sets the HALT mode. In the HALT mode, the CPU operation clock is stopped. If the
high-speed system clock oscillator, internal high-speed oscillator, internal low-speed oscillator, or subsystem
clock oscillator is operating before the HALT mode is set, oscillation of each clock continues. In this mode, the
operating current is not decreased as much as in the STOP mode, but the HALT mode is effective for restarting
operation immediately upon interrupt request generation and carrying out intermittent operations frequently.
(2) STOP mode
STOP instruction execution sets the STOP mode. In the STOP mode, the high-speed system clock oscillator and
internal high-speed oscillator stop, stopping the whole system, thereby considerably reducing the CPU operating
current.
Because this mode can be cleared by an 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 when the X1 clock is selected, select the HALT mode if it is necessary to start processing immediately
upon interrupt request generation.
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 latches and output buffer statuses are also held.
Cautions 1. The STOP mode can be used only when the CPU is operating on the main system clock. The
subsystem clock oscillation cannot be stopped. The HALT mode can be used when the CPU
is operating on either the main system clock or the subsystem clock.
2. When shifting to the STOP mode, be sure to stop the peripheral hardware operation
operating with main system clock before executing STOP instruction.
3. The following sequence is recommended for operating current reduction of the 10-bit
successive approximation type A/D converter when the standby function is used: First clear
bit 7 (ADCS) and bit 0 (ADCE) of the A/D converter mode register (ADM) to 0 to stop the A/D
conversion operation, and then execute the STOP instruction.
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User’s Manual U18698EJ1V0UD