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The subtract instructions subtract the operand from the accumulator, while Microchip's subtract instructions do the reverse. (This makes the subtract immediate instruction redundant, as it is equivalent to an add of the negative.) The move-to-accumulator and clear instructions do not modify any flags.
transfers data from memory to the accumulator store 2 4 12 transfers data from the accumulator to memory read 3 4 (12) puts the data from the IO console to the accumulator write 4 4 (12) sends the data from the accumulator to the IO console add 5 4 12 adds the data from memory to the accumulator and the result is then stored in the accumulator
1-operand (one-address machines), so called accumulator machines, include early computers and many small microcontrollers: most instructions specify a single right operand (that is, constant, a register, or a memory location), with the implicit accumulator as the left operand (and the destination if there is one): load a, add b, store c.
The Mano machine is a computer theoretically described by M. Morris Mano.It contains a central processing unit, random access memory, and an input-output bus.Its limited instruction set and small address space limit it to use as a microcontroller, but it can easily be expanded to have a 32-bit accumulator register, and 28-bit addressing using a hardware description language like Verilog or ...
integer accumulator instructions (together HI/LO registers, moved to the DSP Application-Specific Extension) unaligned load instructions (LWL and LWR), (requiring that most ordinary loads and stores support misaligned access, possibly via trapping and with the addition of a new instruction (BALIGN))
Below is the full 8086/8088 instruction set of Intel (81 instructions total). [2] These instructions are also available in 32-bit mode, in which they operate on 32-bit registers (eax, ebx, etc.) and values instead of their 16-bit (ax, bx, etc.) counterparts.
DOC — send the contents of the specified accumulator to the C register of the device on the specified channel; NIO — "no I/O", a misnomer. The instruction was used to send a signal to a device without doing a register transfer. In addition, four instructions were available to test the status of a device:
Modern processors can even do some of the steps out of order as decoding on several instructions is done in parallel. Decoding the op-code in the instruction register includes determining the instruction, determining where its operands are in memory, retrieving the operands from memory, allocating processor resources to execute the command (in ...