MCP19124 datasheet(72/236 Pages) MICROCHIP

72 / 236 page

MCP19124/5

DS20005619A-page 72

 2016 Microchip Technology Inc.

10.2.3

SPECIAL FUNCTION REGISTERS

The Special Function Registers are registers used by

the CPU and peripheral functions for controlling the

desired operation of the device (refer to Figure 10-2).

These registers are static RAM.

The special registers can be classified into two sets:

• core and

• peripheral

The Special Function Registers associated with the

microcontroller core are described in this section.

Those related to the operation of the peripheral

features are described in the associated section for that

peripheral feature.

bit 3

PD: Power-Down bit

= After power-up or by the CLRWDT instruction

= By execution of the SLEEP instruction

bit 2

Z: Zero bit

= The result of an arithmetic or logic operation is zero

= The result of an arithmetic or logic operation is not zero

bit 1

DC: Digit Carry/Digit Borrow bit (1) (ADDWF, ADDLW, SUBLW, SUBWF instructions)

= A carry-out from the 4th low-order bit of the result occurred

= No carry-out from the 4th low-order bit of the result occurred

bit 0

C: Carry/Borrow bit (1) (ADDWF, ADDLW, SUBLW, SUBWF instructions)

= A carry-out from the Most Significant bit of the result occurred

= No carry-out from the Most Significant bit of the result occurred

STATUS: STATUS REGISTER (CONTINUED)

Note 1: For Borrow, the polarity is reversed. A subtraction is executed by adding the two’s complement of the

second operand. For rotate (RRF, RLF) instructions, this bit is loaded with either the high-order or

low-order bit in the source register.

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