PIC12C671/JW Microchip Technology, PIC12C671/JW Datasheet - Page 70

• Manufacturer Part Number: PIC12C671/JW
• Description: IC MCU EPROM 1KX14 A/D 8CDIP
• Manufacturer: Microchip Technology
• Series: PIC® 12Cr

Specifications of PIC12C671/JW

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 10MHz
• Peripherals: POR, WDT
• Number Of I /o: 5
• Program Memory Size: 1.75KB (1K x 14)
• Program Memory Type: EPROM, UV
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 4x8b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-CDIP (0.300", 7.62mm) Window
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Connectivity: -

PIC12C67X
10.1
The PIC12C67X’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 reg-
ister.
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.
DS30561B-page 70
Special Function Registers as
Source/Destination
STATUS AS DESTINATION
TRIS AS DESTINATION
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
1999 Microchip Technology Inc.
ALU operand
dest
PCH;
PCH;
PCL
PCL