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UPD750004A Datasheet(PDF) 32 Page - NEC |
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UPD750004A Datasheet(HTML) 32 Page - NEC |
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32 / 84 page  32 µPD750004, 750006, 750008, 750004(A), 750006(A), 750008(A) 6.9 BIT SEQUENTIAL BUFFER: 16 BITS The bit sequential buffer (BSB) 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. Fig. 6-9 Bit Sequential Buffer Format Remarks 1. In pmem.@L addressing, bit specification is shifted according to the L register. 2. In pmem.@L addressing, the bit sequential buffer can be manipulated at any time regardless of MBE/ MBS specification. 3210321032103210 BSB3 BSB2 BSB1 BSB0 FC3H FC2H FC1H FC0H L = FH L = CH L = BH L = 8H L = 7H L = 4H L = 3H L = 0H DECS L INCS L Address Bit L register Symbol |
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