SN8P2602B Datasheet, PDF (27/95 Pages) SONiX Technology Company – 8-Bit Micro-Controller

SN8P2602B
8-Bit Micro-Controller
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
PC -
-
-
-
-
- PC9 PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0
After
reset
-
-
-
-
-
-
0000000000
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 FC
; To skip, if Carry_flag = 1
JMP
C0STEP
; Else jump to C0STEP.
…
…
C0STEP:
NOP
C1STEP:
B0MOV
B0BTS0
JMP
…
…
NOP
A, BUF0
FZ
C1STEP
; Move BUF0 value to ACC.
; To skip, if Zero flag = 0.
; Else jump to C1STEP.
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
SONiX TECHNOLOGY CO., LTD
Page 27
Preliminary Version 0.4