Microchip Technology MCU PIC10F322T-I/OT SOT-23-6 MCP PIC10F322T-I/OT 데이터 시트

DS41585A-page 14

 2011 Microchip Technology Inc.

2.2.2.1

STATUS Register

The STATUS register, shown in 

, contains:

• the arithmetic status of the ALU
• the Reset status
• the bank select bits for data memory (SRAM)
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 the write to these three bits is
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 the upper three
bits 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 affect-
ing any Status bits (see 

). 

Bits IRP and RP1 of the STATUS register
are not used by the PIC10(L)F320 and
should be maintained as clear. Use of
these bits is not recommended, since this
may affect upward compatibility with
future products.

The C and DC bits operate as a Borrow
and Digit Borrow out bit, respectively, in
subtraction.