UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 71

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

3.4 Operand Address Addressing
during instruction execution.
3.4.1 Implied addressing
The following methods are available to specify the register and memory (addressing) to undergo manipulation
[Function]
[Operand format]
[Description example]
The register that functions as an accumulator (A and AX) among the general-purpose registers is automatically
(implicitly) addressed.
Of the 78K0/FE2 instruction words, the following instructions employ implied addressing.
Because implied addressing can be automatically employed with an instruction, no particular operand format is
necessary.
In the case of MULU X
With an 8-bit × 8-bit multiply instruction, the product of A register and X register is stored in AX. In this example,
the A and AX registers are specified by implied addressing.
MULU
DIVUW
ADJBA/ADJBS
ROR4/ROL4
Instruction
A register for multiplicand and AX register for product storage
AX register for dividend and quotient storage
A register for storage of numeric values that become decimal correction targets
A register for storage of digit data that undergoes digit rotation
CHAPTER 3 CPU ARCHITECTURE
User’s Manual U17554EJ4V0UD
Register to Be Specified by Implied Addressing
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