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SMBP2501BPB Datasheet(PDF) 35 Page - SONiX Technology Company |
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SMBP2501BPB Datasheet(HTML) 35 Page - SONiX Technology Company |
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35 / 107 page  SN8P2501B 8-Bit Micro-Controller SONiX TECHNOLOGY CO., LTD Page 35 Version 2.1 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. Stack Level STKP Register Stack Buffer Description STKPB1 STKPB0 High Byte Low Byte 0 1 1 Free Free - 1 1 0 STK0H STK0L - 2 0 1 STK1H STK1L - 3 0 0 STK2H STK2L - 4 1 1 STK3H STK3L - > 4 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. Stack Level STKP Register Stack Buffer Description STKPB1 STKPB0 High Byte Low Byte 4 1 1 STK3H STK3L - 3 0 0 STK2H STK2L - 2 0 1 STK1H STK1L - 1 1 0 STK0H STK0L - 0 1 1 Free Free - |
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