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SM5K3

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

Sharp Electronics 

SM5K3/SM5K4/SM5K5

Program Counter PC and Stack Register SR

The program counter PC specifies the ROM

address. The PC consists of 12-bit as shown in

Fig. 5 : The upper 6-bit (PU) represents a page

while the lower 6-bit (PL) denotes a step. The PU

section is a register and the PL section, a binary

counter.

Execution of interrupt handling and the table

reference instruction PAT also automatically uses 1

stage of the stack register SR.

Program counter PC

Page

Step

PU

MSB

Push

PL

LSB

Pop

SR ( level 1 )

SR ( level 2 )

SR ( level 3 )

SR ( level 4 )

Stack register SR

Fig. 5 Program Counter PC and Stack Register SR

Program Memory (ROM)

The ROM is used to store the program. The

capacity of the ROM is 2 048-step (32-page by 64-

step. See Fig. 6). The configuration of the ROM

and program jumps are illustrated in Fig. 7.

Specifies a page (Pages 00H-1FH)

Specifies a page (Pages 00H-3FH)

PU

PL

Fig. 6 Page and Step for ROM

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