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PIC16F15213 датащи(PDF) 52 Page - Microchip Technology |
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PIC16F15213 датащи(HTML) 52 Page - Microchip Technology |
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52 / 420 page ![]() Figure 9-11. Accessing the Stack Example 3 Filename: 10-000043C.vsd Title: ACCESSING THE STACK EXAMPLE 3 Last Edit: 7/30/2013 First Used: PIC16F1508/9 Note: STKPTR = 0x06 After seven CALLs or six CALLs and an interrupt, the stack looks like the figure on the left. A series of RETURN instructions will repeatedly place the return addresses into the Program Counter and pop the stack. Return Address 0x0F 0x0E 0x0D 0x0C 0x0B 0x0A 0x09 0x08 0x07 0x06 0x04 0x05 0x03 0x02 0x01 0x00 Return Address Return Address Return Address Return Address Return Address Return Address TOSH:TOSL Rev. 10-000043C 7/30/2013 Figure 9-12. Accessing the Stack Example 4 Filename: 10-000043D.vsd Title: ACCESSING THE STACK EXAMPLE 4 Last Edit: 7/30/2013 First Used: PIC16F1508/9 Note: STKPTR = 0x10 When the stack is full, the next CALL or an interrupt will set the Stack Pointer to 0x10. This is identical to address 0x00 so the stack will wrap and overwrite the return address at 0x00. If the Stack Overflow/Underflow Reset is enabled, a Reset will occur and location 0x00 will not be overwritten. Return Address 0x0F 0x0E 0x0D 0x0C 0x0B 0x0A 0x09 0x08 0x07 0x06 0x04 0x05 0x03 0x02 0x01 0x00 Return Address Return Address Return Address Return Address Return Address Return Address Return Address Return Address Return Address Return Address Return Address Return Address Return Address Return Address Return Address TOSH:TOSL Rev. 10-000043D 7/30/2013 PIC16F15213/14/23/24/43/44 Memory Organization © 2020 Microchip Technology Inc. Preliminary Datasheet DS40002195A-page 52 |
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