SMBP2501BPB datasheet(27/107 Pages) SONIX

27 / 107 page

SN8P2501B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 27

Version 2.1

2.1.4.6

PROGRAM COUNTER

The program counter (PC) is a 10-bit binary counter separated into the high-byte 2 and the low-byte 8 bits. This

counter is responsible for pointing a location in order to fetch an instruction for kernel circuit. Normally, the program

counter is automatically incremented with each instruction during program execution.

Besides, it can be replaced with specific address by executing CALL or JMP instruction. When JMP or CALL instruction

is executed, the destination address will be inserted to bit 0 ~ bit 9.

Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9

Bit 8

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PC9

PC8

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

After

reset

PCH

PCL



ONE ADDRESS SKIPPING

There are nine instructions (CMPRS, INCS, INCMS, DECS, DECMS, BTS0, BTS1, B0BTS0, B0BTS1) with one

address skipping function. If the result of these instructions is true, the PC will add 2 steps to skip next instruction.

If the condition of bit test instruction is true, the PC will add 2 steps to skip next instruction.

B0BTS1

; To skip, if Carry_flag = 1

JMP

C0STEP

; Else jump to C0STEP.

…

C0STEP:

NOP

B0MOV

A, BUF0

; Move BUF0 value to ACC.

B0BTS0

; To skip, if Zero flag = 0.

JMP

C1STEP

; Else jump to C1STEP.

…

C1STEP:

NOP

If the ACC is equal to the immediate data or memory, the PC will add 2 steps to skip next instruction.

CMPRS

A, #12H

; To skip, if ACC = 12H.

JMP

C0STEP

; Else jump to C0STEP.

…

C0STEP:

NOP

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