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PIC16LF1824 Datasheet(PDF) 41 Page - Microchip Technology |
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PIC16LF1824 Datasheet(HTML) 41 Page - Microchip Technology |
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41 / 440 page ![]() 2011-2013 Microchip Technology Inc. Preliminary DS40001453D-page 41 PIC16(L)F1847 FIGURE 3-7: ACCESSING THE STACK EXAMPLE 4 3.5.2 OVERFLOW/UNDERFLOW RESET If the STVREN bit in Configuration Words is set 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 TOSH:TOSL 0x0F 0x0E 0x0D 0x0C 0x0B 0x0A 0x09 0x08 0x03 0x02 0x01 0x00 0x04 0x05 0x06 0x07 Return Address When the stack is full, the next CALL or 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. STKPTR = 0x10 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 |
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