PIC16F15213 datasheet(16/408 Pages) MICROCHIP

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5.1

When there are multiple instances of the same peripheral in a device, the Peripheral Control registers will be depicted

as the concatenation of a peripheral identifier, peripheral instance, and control identifier. The control registers section

will show just one instance of all the register names with an ‘x’ in the place of the peripheral instance number. This

naming convention may also be applied to peripherals when there is only one instance of that peripheral in the device

to maintain compatibility with other devices in the family that contain more than one.

5.2

Bit Names

There are two variants for bit names:

• Short name: Bit function abbreviation

• Long name: Peripheral abbreviation + short name

5.2.1

Short Bit Names

Short bit names are an abbreviation for the bit function. For example, some peripherals are enabled with the EN bit.

The bit names shown in the registers are the short name variant.

Short bit names are useful when accessing bits in C programs. The general format for accessing bits by the short

name is RegisterNamebits.ShortName. For example, the enable bit, ON, in the ADCON0 register can be set in C

programs with the instruction ADCON0bits.ON = 1.

Short names are generally not useful in assembly programs because the same name may be used by different

peripherals in different bit positions. When this occurs, during the include file generation, all instances of that short bit

name are appended with an underscore plus the name of the register in which the bit resides to avoid naming

contentions.

5.2.2

Long Bit Names

Long bit names are constructed by adding a peripheral abbreviation prefix to the short name. The prefix is unique to

the peripheral, thereby making every long bit name unique. The long bit name for the ADC enable bit is the ADC

prefix, AD, appended with the enable bit short name, ON, resulting in the unique bit name ADON.

Long bit names are useful in both C and assembly programs. For example, in C the ADCON0 enable bit can be set

with the ADON = 1 instruction. In assembly, this bit can be set with the BSF ADCON0,ADON instruction.

5.2.3

Bit Fields

Bit fields are two or more adjacent bits in the same register. Bit fields adhere only to the short bit naming convention.

For example, the three Least Significant bit of the ADCON2 register contain the ADC Operating Mode Selection bit.

The short name for this field is MD and the long name is ADMD. Bit field access is only possible in C programs. The

following example demonstrates a C program instruction for setting the ADC to operate in Accumulate mode:

ADCON2bits.MD = 0b001;

Individual bits in a bit field can also be accessed with long and short bit names. Each bit is the field name appended

with the number of the bit position within the field. For example, the Most Significant mode bit has the short bit name

MD2 and the long bit name is ADMD2. The following two examples demonstrate assembly program sequences for

setting the ADC to operate in Accumulate mode:

MOVLW

~(1<<MD2 | 1<<MD1)

ANDWF

ADCON2,F

PIC16F15225/45

Preliminary Datasheet

DS20006389B-page 16

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