UPD75312 Datasheet, PDF (37/62 Pages) NEC – 4-BIT SINGLE-CHIP MICROCOMPUTER

(2) Legend of operation field
A
: A register; 4-bit accumulator
B
: B register; 4-bit accumulator
C
: C register; 4-bit accumulator
D
: D register; 4-bit accumulator
E
: E register; 4-bit accumulator
H
: H register; 4-bit accumulator
L
: L register; 4-bit accumulator
X
: X register; 4-bit accumulator
XA : Register pair (XA); 8-bit accumulator
BC : Register pair (BC); 8-bit accumulator
DE : Register pair (DE); 8-bit accumulator
HL : Register pair (HL); 8-bit accumulator
PC : Program counter
SP : Stack pointer
CY : Carry flag; or bit accumulator
PSW : Program status word
MBE : Memory bank enable flag
PORTn : Port n (n = 0 to 7)
IME : Interrupt mask enable flag
IExxx : Interrupt enable flag
MBS : Memory bank selector register
PCC : Processor clock control register
.
: Delimiter of address and bit
(xx) : Contents addressed by xx
xxH : Hexadecimal data
µPD75312(A), 75316(A)
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