UPD75064 Datasheet, PDF (26/68 Pages) NEC – 4-BIT SINGLE-CHIP MICROCOMPUTER

µPD75064, 75066, 75068, 75064(A), 75066(A), 75068(A)
5.9 Bit Sequential Buffer: 16 Bits
The bit sequential buffer is a data memory specifically provided for bit manipulation. With this buffer,
addresses and bit specifications can be sequentially updated by bit manipulation operation. Therefore, this
buffer is very useful for processing long data in bit units.
Figure 5-8. Bit Sequential Buffer Format
Address
FC3H
FC2H
FC1H
FC0H
Bit
3210321032103210
Symbol
BSB3
BSB2
BSB1
BSB0
L register L = F
L=C L=B
L=8 L=7
INCS L
L=4 L=3
DECS L
L=0
Remark For "pmem.@L" addressing, the specification bit is shifted according to the L register.
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