PIC16F684 Registers - Revision history

Stephens: /* A/D Configuration and Usage */

2006-07-11T20:38:10Z

A/D Configuration and Usage

2006-07-10T23:18:52Z

PWM Configuration and Usage

2006-07-10T23:03:43Z

2006-07-10T22:52:54Z

A/D Configuration and Usage

2006-07-10T22:50:09Z

2006-07-10T22:34:51Z

2006-07-10T22:29:47Z

I/O

2006-07-10T22:23:18Z

I/O

2006-07-10T22:15:39Z

2006-07-10T22:02:38Z

Memory Map

@@ Line 65: / Line 65: @@
 * Results formatting (ADCON0)
-====ADCON1====
+====ADCON0====
 [[image:PIC register ADCON0.png|center]]
-====ADCON0====
+====ADCON1====
 [[image:PIC register ADCON1.png|center]]
@@ Line 89: / Line 89: @@
 :'''Left Justified (ADMF=0):'''
 [[image:PIC register ADRESLL.png|center]]
 ===PWM Configuration and Usage===

@@ Line 92: / Line 92: @@
 ===PWM Configuration and Usage===
+The PWM duty cycle is specified by writing a 10-bit value to multiple registers: CCPR1L register and CCP1<1:0> bits of the CCP1CON register. The CCPR1L contains the eight MSbs and the CCP1<1:0> bits of the CCP1CON register contain the two LSbs.
 ====CCP1CON====
@@ Line 97: / Line 98: @@
 [[image:PIC register CCP1CON.png|center]]
+====CCPR1L====
+The CCPR1L register holds the 8 MSbs of the PWM duty cycle.  '''If you are using an analog input to determine the duty cycle, you should set up the A/D to be left justified and then all you have to do is copy ADRESH to CCPR1L.'''
+====PR2====
+The PR2 is an 8-bit register used to set the PWM period.  This must be set along with the Timer2 prescale in T2CON.  The table below shows the results:
+[[image:PIC PWM Frequencies.png|center]]

@@ Line 89: / Line 89: @@
 :'''Left Justified (ADMF=0):'''
 [[image:PIC register ADRESLL.png|center]]
+===PWM Configuration and Usage===
+====CCP1CON====
+The CCP1CON register configures PWM output by selecting Single, Half or Full-Bridge modes.  These modes were created to make interfacing the PIC16F684 with H-Bridges and Full-Bridges simple.
+[[image:PIC register CCP1CON.png|center]]

@@ Line 62: / Line 62: @@
 * ADC voltage reference selection (ADCON0)
 * ADC conversion clock source (ADCON1)
-* Interrupt control
+* Interrupt control (INTCON)
 * Results formatting (ADCON0)

@@ Line 54: / Line 54: @@
 T2CON sets up Timer2, which is used for PWM timing.
 [[image:PIC register T2CON.png|center]]
+===A/D Configuration and Usage===
+When configuring and using the ADC the following functions must be considered:
+* Port configuration (ANSEL)
+* Channel selection (ADCON0)
+* ADC voltage reference selection (ADCON0)
+* ADC conversion clock source (ADCON1)
+* Interrupt control
+* Results formatting (ADCON0)
+====ADCON1====
+[[image:PIC register ADCON0.png|center]]
+====ADCON0====
+[[image:PIC register ADCON1.png|center]]
+====ADRESH====
+ADRESH contains the highest significant digits of the A/D conversion.  The values contained in this register depend on whether you select "Right Justified" (ADFM=1) or "Left Justified" (ADFM=0) results.
+:'''Right Justified (ADFM=1):'''
+[[image:PIC register ADRESHR.png|center]]
+:'''Left Justified (ADMF=0):'''
+[[image:PIC register ADRESHL.png|center]]
+====ADRESL====
+ADRESL contains the lowest significant digits of the A/D conversion.  The values contained in this register depend on whether you select "Right Justified" (ADFM=1) or "Left Justified" (ADFM=0) results.
+:'''Right Justified (ADFM=1):'''
+[[image:PIC register ADRESLR.png|center]]
+:'''Left Justified (ADMF=0):'''
+[[image:PIC register ADRESLL.png|center]]

@@ Line 48: / Line 48: @@
 ====TRISC====
 [[image:PIC register TRISC.png|center]]
+===Timers===
+====T2CON====
+T2CON sets up Timer2, which is used for PWM timing.
+[[image:PIC register T2CON.png|center]]

@@ Line 36: / Line 36: @@
 ====ANSEL====
-The ANSEL register determines whether a pin AN<7:0> is an analog input or not.
+The ANSEL register determines whether a pin, AN<7:0>, is an analog input or not.
 [[image:PIC register ANSEL.png|center]]
+====IOCA====
+The IOCA register determines whether or not an interrupt is generated when a digital pin on PORTA, RA<5:0>, experiences a change in value.
+[[image:PIC register IOCA.png|center]]
+====PORTC====
+[[image:PIC register PORTC.png|center]]
+====TRISC====
+[[image:PIC register TRISC.png|center]]

@@ Line 12: / Line 12: @@
 ==Register Descriptions==
-===STATUS===
+===Configuration===
+====STATUS====
 [[image:PIC register STATUS.png|center]]
-===OPTION===
+====OPTION====
 [[image:PIC register OPTION.png|center]]
-===INTCON===
+====INTCON====
 [[image:PIC register INTCON.png|center]]
+====PIE1====
+The PIE1 is used to enable/disable interrupts.
+[[image:PIC register PIE1.png|center]]
+===I/O===
+====PORTA====
+[[image:PIC register PORTA.png|center]]
+====TRISA====
+[[image:PIC register TRISA.png|center]]

@@ Line 2: / Line 2: @@
 ==Memory Map==
+These images show the memory map of the PIC16F684.  Use these for a quick reference for register addresses and initial values.
 ===Registers in Memory Bank 0===