PIC16F15213 datasheet(47/439 Pages) MICROCHIP

47 / 439 page

9.3

STATUS Register

The STATUS register contains:

• the arithmetic status of the ALU

• the Reset status

The STATUS register can be the destination for any instruction, like any other register. If the STATUS register is the

destination for an instruction that affects the Z, DC or C bits, then writes to these three bits are disabled. These bits

are set or cleared according to the device logic. Furthermore, the TO and PD bits are not writable. Therefore, the

result of an instruction with the STATUS register as destination may be different than intended.

For example, CLRF STATUS will clear bits [4:3] and [1:0], and set the Z bit. This leaves the STATUS register as

‘000u u1uu’ (where u = unchanged).

It is recommended, therefore, that only BCF, BSF, SWAPF and MOVWF instructions are used to alter the STATUS

register, because these instructions do not affect any Status bits. For other instructions not affecting any Status bits,

refer to the “Instruction Set Summary” chapter.

Important: The C and DC bits operate as Borrow and Digit Borrow out bits, respectively, in subtraction.

9.4

PCL and PCLATH

The Program Counter (PC) is 15 bits wide. The low byte comes from the PCL register, which is a readable and

writable register. The high byte (PC[14:8]) is not directly readable or writable and comes from PCLATH. On any

Reset, the PC is cleared. Loading of PC in Different Situations shows the five situations for the loading of the PC.

PIC16F15213/14/23/24/43/44

Memory Organization

and its subsidiaries

Data Sheet

DS40002195E-page 47

PIC16F15213 データシート(PDF) 47 Page - Microchip Technology