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GMS34112 Datasheet(PDF) 21 Page - Hynix Semiconductor |
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GMS34112 Datasheet(HTML) 21 Page - Hynix Semiconductor |
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21 / 105 page  2 - 4 Y-register (Y) Y-register has 4 bits. It operates as a data pointer or a general-purpose register. Y-register specifies and address (a 0~a3) in a page of data memory, as well as it is used to specify an output port. Further it is used to specify a mode of carrier signal outputted from the REMOUT port. It can also be treated as a general- purpose register on a program. Accumulator (A CC) The 4-bit register for holding data and calculation results. Arithmetic and Logic Unit (ALU) In this unit, 4bits of adder/comparator are connected in parallel as it`s main components and they are combined with status latch and status logic (flag.) (1) Operation circuit (ALU) : The adder/comparator serves fundamentally for full addition and data comparison. It executes subtraction by making a complement by processing an inversed output of A CC (ACC+1) (2) Status logic : This is to bring an ST, or flag to control the flow of a program. It occurs when a specified instruction is executed in two cases such as overflow in operation and two inputs unequal. Chapter 2. Architecture |
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