CHAPTER 8 STANDBY FUNCTION
216 User’s Manual U10676EJ3V0UM
8.1 Settings and Operating Statuses of Standby Mode

Table 8-1. Operating Statuses in Standby Mode

STOP Mode HALT Mode
Instruction to be set STOP instruction HALT instruction
Operating status Clock generator Operation stopped Only CPU clock Φ is stopped
(oscillation continues)
Basic interval timer/ Operation stopped Operation possible
watchdog timer BT mode: Sets IRQBT at reference
time intervals
WT mode: Generates reset signal
when BT overflows
Timer counter Operation stopped Operation possible
External interrupt INT0 cannot operateNote
INT2 can only operate at KRn fall.
CPU Operation stopped
Release signal •Reset signal • Reset signal
• Interrupt request signal from hardware • Interrupt request signal from hardware
in which interrupt is enabled in which interrupt is enabled
• System reset signal (key return reset)
generated by KRn fall when KRREN
pin is 1

Note Operation is possible only when the noise eliminator is not selected (when IM02 = 1) by bit 2 of the edge

detection mode register (IM0).