PIC12CE67 Microchip Technology, PIC12CE67 Datasheet - Page 62
PIC12CE67
Manufacturer Part Number
PIC12CE67
Description
8-Pin/ 8-Bit CMOS Microcontroller with A/D Converter and EEPROM Data Memory
Manufacturer
Microchip Technology
Datasheet
1.PIC12CE67.pdf
(116 pages)
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PIC12CE67X
10.1
The PIC12CE67X’s orthogonal instruction set allows
read and write of all file registers, including special
function registers. There are some special situations
the user should be aware of:
10.1.1
If an instruction writes to STATUS, the Z, C and DC bits
may be set or cleared as a result of the instruction and
overwrite the original data bits written. For example,
executing CLRF STATUS will clear register STATUS, and
then set the Z bit leaving 0000 0100b in the register.
10.1.2
Bit 3 of the TRIS register always reads as a '1' since
GP3 is an input only pin. This fact can affect some read-
modify-write operations on the TRIS register.
DS40181B-page 62
Special Function Registers as
Source/Destination
STATUS AS DESTINATION
TRIS AS DESTINATION
Preliminary
10.1.3
Read, write or read-modify-write on PCL may have the
following results:
Read PC:
Write PCL:
Read-Modify-Write:
Where PCH = program counter high byte (not an
addressable register), PCLATH = Program counter
high holding latch, dest = destination, WREG or f.
10.1.4
All bit manipulation instructions are done by first read-
ing the entire register, operating on the selected bit and
writing the result back (read-modify-write). The user
should keep this in mind when operating on special
function registers, such as ports.
PCL AS SOURCE OR DESTINATION
BIT MANIPULATION
PCL
PCLATH
8-bit destination value
PCL
PCLATH
8-bit result
1998 Microchip Technology Inc.
ALU operand
dest
PCH;
PCH;
PCL
PCL