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UPD784938 Datasheet(PDF) 91 Page - NEC |
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UPD784938 Datasheet(HTML) 91 Page - NEC |
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91 / 733 page  91 CHAPTER 3 CPU ARCHITECTURE Preliminary User’s Manual U13987EJ1V0UM00 Cautions 1. With stack addressing, the entire 1-Mbyte space can be accessed but a stack area cannot be reserved in the SFR area or internal ROM area. 2. The stack pointer (SP) is undefined after RESET input. Moreover, non-maskable interrupts can still be acknowledged when the SP is in an undefined state. An unanticipated operation may therefore be performed if a non-maskable interrupt request is generated when the SP is in the undefined state directly after reset release. To avoid this risk, the program after reset release must be written as follows. RSTVCT CSEG AT 0 DW RSTSTRT to INITSEG CSEG BASE RSTSTRT : LOCATION 0H ; or LOCATION 0FH MOVG SP, #STKBGN |
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