SM5K3 Ver la hoja de datos (PDF) - Sharp Electronics

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SM5K3

4-Bit Single-Chip Microcomputers (Controllers With 10-Bit A/D Converter)

Sharp Electronics 

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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