ccp.txt

picc_18v 8.35pl35 PIC18系列单片机开发C编译器

Title: timer1

Target: PIC18Cxx8

Description:
	 A sample project file to be used with HI-TIDE, to demonstrate the functionality of the microcontroller's 
	 CAPTURE/COMPARE/PWM (CCP) MODULES. This project tests CAPTURE and COMPARE operations.
	 PWM is tested in a separate project.

	Each CCP (Capture/Compare/PWM) module contains a 16-bit register that can operate as a 16-bit 
	capture register, as a 16-bit compare register, or as a PWM Duty Cycle register. Table 14-1 shows 
	the timer resources of the CCP module modes.

	CCP1 Module
	Capture/Compare/PWM Register1 (CCPR1) is comprised of two 8-bit registers: CCPR1L (low byte) and
	CCPR1H (high byte). The CCP1CON register controls the operation of CCP1. All are readable and writable.

	CCP2 Module
	Capture/Compare/PWM Register2 (CCPR2) is comprised of two 8-bit registers: CCPR2L (low byte) and
	CCPR2H (high byte). The CCP2CON register controls the operation of CCP2. All are readable and writable.

Controls:

	Both CCP1 and CCP2 are identical in their operation, except that the CCP2 Special Event Trigger will start
	an A/D conversion if the A/D module is enabled. The CCPx module can operate in one of 12 modes
	(including PWM and OFF modes). The CCPx mode is defined via CCPxCON register. The register's contens
	are changed when corresponding PUSH button is pressed. Current value of CCP1CON and CCP2CON are 
	displayed using 4-bit RED and BLUE LED pannels respectively.

	Each CCP module is assigned an IO pin (RC1 for CCP2, and RC2 for CCP1). Each pin is automatically 
	configured as Input or Output by the project code depending on current modes of corresponding CCP modules.
	Each CCP IO pin is connected  to an LED and a PUSH button. PUSH button is used to generate events when CCP 
	is in CAPTURE mode. LED is used to indicate even when CCP is in COMPARE mode.

	Two 8-bit DIP switches are used to set values of CCPR1L and CCPR2L registers when CCPs are used in
	COMPARE mode. Note:CCPR1H and CCPR2H are always set to 0.

	USART is used to provide additional information about the current status of the CCPs module.

	 Note: To understand available modes of operation, please refer to the datasheet for the PIC18Cxx8 device.

Connections to the PIC18Cxx8:
	Pushbutton 1				-> PORTB4
	LED RED   [0..3] 1		 	-> PORTF[0..3]
	DIP RED   [0..7] 1			-> PORTD[0..7]           
	Pushbutton 2				-> PORTC2
	LED RED 2					-> PORTC2   
	Pushbutton 3				-> PORTB5
	LED BLUE [0..3] 3			-> PORTF[4..7]
	DIP BLUE [0..7] 2			-> PORTH[0..7]           
	Pushbutton 4				-> PORTE7
	LED RED 4					-> PORTE7