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A very late ans:
From instruction set summary
SUBWF Subtract W from f
Syntax: [ label ] SUBWF f,d
Operands: 0 ≤ f ≤ 127
d ∈ [0,1]
Operation: (f) - (W) → (destination)
Status
Affected:
C, DC, Z
Description: Subtract (2’s complement method)
W register from register 'f'. If 'd' is 0,
the result...
Vbe act as volage reference based switching.
0V input outputs hi and +.7V and above outputs low logic state. Also acts as inverter. this base emiter diode forward biasing voltage gives good control for drive voltage reqirements with respect to ground.
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