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UPD784938 Datasheet(PDF) 95 Page - NEC

Part # UPD784938
Description  16-Bit Single-Chip Microcontrollers
Download  733 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD784938 Datasheet(HTML) 95 Page - NEC

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CHAPTER 3 CPU ARCHITECTURE
Preliminary User’s Manual U13987EJ1V0UM00
VVP (RG4):
• Has a pointer function, and operates as the register that specifies the base address in register indirect addressing,
based addressing and based indexed addressing.
UUP (RG5):
• Has a user stack pointer function, and enables a stack separate from the system stack to be implemented by means
of the PUSHU and POPU instructions.
• Has a pointer function, and operates as the register that specifies the base address in register indirect addressing and
based addressing.
DE (RP6), HL (RP7):
• Operate as the registers that store the offset value in indexed addressing and based indexed addressing.
TDE (RG6):
• Has a pointer function, and operates as the register that specifies the base address in register indirect addressing and
based addressing.
• Used as the pointer in a string instruction and the SACW instruction.
WHL (RG7):
• Register used mainly for 24-bit data transfers and operation processing.
• Has a pointer function, and operates as the register that specifies the base address in register indirect addressing and
based addressing.
• Used as the pointer in a string instruction and the SACW instruction.


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