uPD789074 Subseries 8-Bit Single-Chip Microcontrollers UD - Home

CHAPTER 11 STANDBY FUNCTION(b) Releasing by non-maskable interrupt requestHALT mode is released regardless of whether interrupts are enabled or disabled, and vectored interruptservicing is performed.(c) Releasing by RESET inputWhen HALT mode is released by the RESET signal, execution branches to the reset vector address inthe same manner as the ordinary reset operation, and program execution starts.Figure 11-3. Releasing HALT Mode by RESET InputHALTinstructionWait (2 15 /fX) NoteRESETsignalOperatingmodeHALT modeResetperiodOscillationstabilizationwait statusOperatingmodeClockOscillationOscillationstopOscillationNote 3.28 ms (at fX = 10.0 MHz operation), 6.55 ms (at fX = 5.0 MHz operation)Remark fX: System clock oscillation frequencyTable 11-2. Operation After Releasing HALT ModeReleasing Source MK×× IE OperationMaskable interrupt request0 0 Executes next address instruction.0 1 Executes interrupt servicing.1 × Retains HALT mode.Non-maskable interrupt request − × Executes interrupt servicing.RESET input − − Reset processing×: Don't care168User’s Manual U14801EJ3V1UD