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Status Bits
This schematic contains OSU8's status bits. The four program
visible status bits, C (carry), N (negative), Z (zero), P (pointer
equal) are stored here. The Carry bit may receive its value from
may possible sources, which are mulitplexed here.
OSU8 also specifies four output port bits, which may be loaded
from the Carry bit. Those port bit latches and the circuitry to
load them from the Carry bit are located in the lower right
section of this schematic. OSU8's two input port pins are just
inputs the multiplexor that loads the carry bit. Thost two input
bits are not latched, they just just copied into the carry bit
at the instant that a MOV IN0, C or
MOV IN1, C instruction is executed.
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Schematic
CPU Programming