PIC16C83 datasheet(14/117 Pages) MICROCHIP

14 / 117 page

PIC16C8X

DS30081F-page 14

4.2.2.1

STATUS REGISTER

The STATUS register contains the arithmetic status of

the ALU, the RESET status and the bank select bit for

data memory.

As with any register, the STATUS register can be the

destination for any instruction. If the STATUS register is

the destination for an instruction that affects the Z, DC

or C bits, then the write to these three bits is disabled.

These bits are set or cleared according to device logic.

Furthermore, the TO and PD bits are not writable.

Therefore, the result of an instruction with the STATUS

For example, CLRF STATUS will clear the upper-three

bits and set the Z bit. This leaves the STATUS register

as 000u u1uu (where u = unchanged).

Only the BCF, BSF, SWAPF and MOVWF instructions

should be used to alter the STATUS register (Table 9-2)

because these instructions do not affect any status bit.

Note 1: The IRP and RP1 bits (STATUS<7:6>) are

not used by the PIC16C8X and should be

programmed as cleared. Use of these bits

as general purpose R/W bits is NOT

recommended, since this may affect

upward compatibility with future products.

Note 2: The C and DC bits operate as a borrow

and digit borrow out bit, respectively, in

subtraction. See the SUBLW and SUBWF

instructions for examples.

Note 3: When

the

STATUS

the

destination for an instruction that affects

the Z, DC or C bits, then the write to these

three bits is disabled. The speciﬁed bit(s)

will be updated according to device logic.

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