Getting Started with PIC Microcontrollers by F. Stevens

By F. Stevens

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To determine whether two bytes are the same, they can be subtracted and the zero bit of the STATUS register tested to see if it is set as was done in previous code examples. Alternatively, an Exclusive-OR operation can be performed and the STATUS bit tested using either btfsc or btfss as follows: movlw B’10101101’ xorlw B’10101101’ btfsX STATUS,2 ; X could be ‘s’ or ‘c’. When the numbers are the same, the result of the Exclusive-OR operation will be zero. 5 Bit rotations The instructions rotate left through carry (rlf) and rotate right through carry (rrf) are used when a byte needs to be shifted left or right by one bit position through the carry bit.

Bits 0, 1 and 2 of the OPTION register are set to zero to give a prescaler division ratio of 2:1. Bit 3 is cleared to assign the prescaler to the counter/timer module. The value of bit 4 is irrelevant in this case, because pin TOCKI is not being used by the module. Bit 5 is cleared so that the internal clock is used and bit 6 is set so that the register TMR0 increments on the rising edge of the clock signal. The value of bit 7 is also not relevant and can be either cleared or set. The nop instruction is used here merely for demonstrative purposes so that the program can be stepped through one instruction at a time.

6) where ti = 4/f0 and the additional 40nsec delay is required for the logic circuitry to settle. 7) fmax < 4 ti where P S is the prescaler division ratio (between 2 and 256). After sampling, the information is processed, resulting in a total delay from the input signal transition to when the TMR0 register is incremented, of up to two instruction cycles. 1 Setting up the timer/counter module The first decision to be made is whether to use timer or counter mode. Next, if the input frequency to the module needs to be scaled down by the divider, the prescaler must be selected and the division ratio chosen.

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