InitPortC:
;PORTC is a multifaceted port supporting I/O for several
;  onboard peripherals.
;   bit pin name
;	--- --- ---
;	0   11  RC0/T1OSC/T1CKI	Timer1 I/O
;	1   12  RC1/T1OSI/CCP2	Timer1,Capture/Compare I/O
;	2   13  RC2/CCP1		Capture/Compare/PWM I/O
;	3   14  RC3/SCK/SCL	SPI/i2c I/O
;	4   15  RC4/SDI/SDA	SPI/i2c I/O
;	5   16  RC5/SDO		SPI I/O
;	6   17  RC6/TX/CK	O	USART
;	7   18  RC7/RX/DT	I	USART
;
;	* I'm using these pins
;		0 = output
;		I = input
;		T = tristate input/output
;
	clrf	PORTC
page1
movlw	B'10111001'	; 0=outputs
;	||| |
;	||| |
;	||| |
;	||| |
;	||| +-------------SCL I2C clock --->:
;	||+-------SDO (Serial Data Out)
;	||
;	||
;	||
;	|+-----------------UART TX --->:
;	+---------------UART RX <:---
	movwf	TRISC
	page0
	return

Listing 5—Here’s a good example of how the PIC spins the pins.