UPD784938 Datasheet, PDF (74/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 3 CPU ARCHITECTURE
3.3 Base Area
The space from 0 to FFFFH comprises the base area. The base area is the object for the following uses:
• Reset entry address
• Interrupt entry address
• CALLT instruction entry address
• 16-bit immediate addressing mode (with instruction address addressing)
• 16-bit direct addressing mode
• 16-bit register addressing mode (with instruction address addressing)
• 16-bit register indirect addressing mode
• Short direct 16-bit memory indirect addressing mode
The vector table area, CALLT instruction table area and CALLF instruction entry area are allocated to the base area.
When the LOCATION 0 instruction is executed, the internal data area is located in the base area. Note that, in the internal
data area, program fetches cannot be performed from the internal high-speed RAM area or special function register (SFR) area.
Also, internal RAM area data should only be used after initialization has been performed.
74
Preliminary User’s Manual U13987EJ1V0UM00