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SN8P2613 Datasheet(PDF) 36 Page - SONiX Technology Company |
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SN8P2613 Datasheet(HTML) 36 Page - SONiX Technology Company |
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36 / 102 page  SN8P2610 Series 8-Bit Micro-Controller SONiX TECHNOLOGY CO., LTD Page 36 Version 1.3 2.3.3 STACK OPERATION EXAMPLE The two kinds of Stack-Save operations refer to the stack pointer (STKP) and write the content of program counter (PC) to the stack buffer are CALL instruction and interrupt service. Under each condition, the STKP decreases and points to the next available stack location. The stack buffer stores the program counter about the op-code address. The Stack-Save operation is as the following table. STKP Register Stack Buffer Stack Level STKPB2 STKPB1 STKPB0 High Byte Low Byte Description 0 1 1 1 Free Free - 1 1 1 0 STK0H STK0L - 2 1 0 1 STK1H STK1L - 3 1 0 0 STK2H STK2L - 4 0 1 1 STK3H STK3L - > 4 0 1 0 - - Stack Over, error There are Stack-Restore operations correspond to each push operation to restore the program counter (PC). The RETI instruction uses for interrupt service routine. The RET instruction is for CALL instruction. When a pop operation occurs, the STKP is incremented and points to the next free stack location. The stack buffer restores the last program counter (PC) to the program counter registers. The Stack-Restore operation is as the following table. STKP Register Stack Buffer Stack Level STKPB2 STKPB1 STKPB0 High Byte Low Byte Description 4 0 1 1 STK3H STK3L - 3 1 0 0 STK2H STK2L - 2 1 0 1 STK1H STK1L - 1 1 1 0 STK0H STK0L - 0 1 1 1 Free Free - |
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