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PIC16F1507-E/SS. Arkusz danych(PDF) 33 Page - Microchip Technology |
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PIC16F1507-E/SS. Arkusz danych(HTML) 33 Page - Microchip Technology |
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33 / 278 page ![]() 2011-2015 Microchip Technology Inc. DS40001586D-page 33 PIC16(L)F1507 FIGURE 3-7: ACCESSING THE STACK EXAMPLE 4 3.5.2 OVERFLOW/UNDERFLOW RESET If the STVREN bit in Configuration Words is programmed to ‘1’, the device will be reset if the stack is PUSHed beyond the sixteenth level or POPed beyond the first level, setting the appropriate bits (STKOVF or STKUNF, respectively) in the PCON register. 3.6 Indirect Addressing The INDFn registers are not physical registers. Any instruction that accesses an INDFn register actually accesses the register at the address specified by the File Select Registers (FSR). If the FSRn address specifies one of the two INDFn registers, the read will return ‘0’ and the write will not occur (though Status bits may be affected). The FSRn register value is created by the pair FSRnH and FSRnL. The FSR registers form a 16-bit address that allows an addressing space with 65536 locations. These locations are divided into three memory regions: • Traditional Data Memory • Linear Data Memory • Program Flash Memory 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 |
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