SM5K3 Datasheet, PDF (10/28 Pages) Sharp Electrionic Components – 4-Bit Single-Chip Microcomputers(Controllers With 10-Bit A/D Converter)

SM5K3/SM5K4/SM5K5
B Register and SB Register
• B register (BM, BL)
The B register is an 8-bit register that is used to
specify the RAM address. The upper 4-bit section
is called BM register and lower 4-bit BL.
• SB register
The SB register is an 8-bit register used as the
save register for the B register. The contents of B
register and SB register can be exchanged through
EX instruction.
3
03
0
B register BM register
BL register
EX instruction (swap)
7
0
SB register
Fig. 3 B Register and SB Register
Data Memory (RAM)
The data memory (RAM) is used to store data up
to 4 x 16 x 8 = 512 bits.
Word (0-FH)
File
(0-7)
BL _{0 1 2 3 4 5 6 7 8 9 A B C D E F}
BM
0
1
2
3
4
5
6
7
1 word = 4-bit
Fig. 4 RAM File and Word
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