em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 60

• Manufacturer Part Number: em78f644nso28s
• Description: Flash Series 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

EM78F648/644/642/641/548/544/542/541N
8-Bit Microcontroller
50 •
"ADD R2, A" allows a relative address to be added to the current PC, and the
ninth and above bits of the PC will increase progressively.
"MOV R2, A" allows to load an address from the "A" register to the lower 8 bits of
the PC, and the ninth and above bits of the PC are not changed.
•Any instruction (except “ADD R2,A”) that is written to R2 (e.g., "MOV R2, A", "BC
R2, 6",⋅etc.) will cause the ninth bit and the above bits (A8~A11) of the PC to
remain unchanged.
All instruction are single instruction cycle (fclk/2,fclk/4,fclk/8,fclk/16). The instruction
that would change the contents of R2 will need one more instruction cycles.
Figure 6-6 Program Counter Structure
(This specification is subject to change without further notice)
Product Specification (V1.0) 05.05.2010