;******************************************************************************************
;  PIC18F14K50 Sample Program
;   Project      :
;   Program Name :
;   Programer    :
;   Create date  :  Version 1.0    H21.12.20
;   History      :
;   Laungage     :  MPASM
;******************************************************************************************
;  (1)Description
;
;******************************************************************************************

	LIST	P=PIC18F14K50,ST=OFF,R=DEC
	INCLUDE	"P18F14K50.inc"

	config CPUDIV = NOCLKDIV	;CPU System Clock Selection bit(No CPU System Clock divide)
	config USBDIV = OFF	;USB Clock Selection bit(USB Clock comes directly from the OSC1/OSC2 oscillator block; no divide)
	config FOSC = HS	;Oscillator Selection bits(HS oscillator)
	config PLLEN = ON	;X PLL Enable bit(Oscillator multiplied by 4)
	config PCLKEN = OFF	;Primary Clock Enable Bit(Primary clock is under software control)
	config FCMEN = OFF
	config IESO = OFF	;Internal/External Oscillator Switchover bit(Oscillator Switchover mode disabled)
	config PWRTEN = OFF,BOREN = OFF,BORV = 19
	config WDTEN = OFF,WDTPS = 1
	config MCLRE = OFF	;MCLR Pin Enable bit(RE3 input pin enabled; MCLR disabled)
	config HFOFST = OFF,STVREN = OFF,LVP = OFF,BBSIZ = OFF,XINST = OFF
	config CP0 = OFF,CP1 = OFF,CPB = OFF,CPD = OFF,WRT0 = OFF,WRT1 = OFF,WRTB = OFF,WRTC = OFF,WRTD = OFF,EBTR0 = OFF,EBTR1 = OFF,EBTRB = OFF

LP0	EQU	00H
LP1	EQU	01H
LP2	EQU	02H
LP3	EQU	03H
LEDLST	EQU	04H

	ORG	0h
	GOTO	START
	ORG	8h
	GOTO	START
	ORG	18h
	GOTO	START
START
	MOVLW	B'00000000'
	MOVWF	TRISC
	MOVLW	B'11111111'
	MOVWF	PORTC
	MOVLW	B'00000001'
	MOVWF	LEDLST
MAIN
	CALL	MOVLED
	CALL	WAT
	GOTO	MAIN

;******************************************************************************************
;   Function Name : MOVLED
;   Title         : 
;   Input         : 
;   Output        : 
;******************************************************************************************
MOVLED
	MOVF	LEDLST,W
	MOVWF	PORTC
	RLCF	LEDLST
;
	MOVF	LEDLST,W
	XORLW	H'00'
	BTFSS	STATUS,Z
	RETURN
	MOVLW	B'00000000'
	MOVWF	LEDLST
	RLCF	LEDLST

	RETURN

;******************************************************************************************
;   Function Name : WAT
;   Title         : wait function (1S)
;   Input         : 
;   Output        : 
;******************************************************************************************
WAT
	MOVLW	H'64'
	MOVWF	LP0	
WAT0
	CALL	Timer
	DECFSZ	LP0
	GOTO	WAT0

	RETURN

;******************************************************************************************
;  Function Name : Timer
;  Title         : wait function (10mS)
;  Input         :
;  Output        :
;******************************************************************************************
Timer:

; *******************************************************
; 1.Define T1CON(TIMER1 CONTROL REGISTER) Register
;   T1CON(7)  RD16: 16-bit Read/Write Mode Enable bit
;                      1 = Enables register read/write of TImer1 in one 16-bit operation
;                      0 = Enables register read/write of Timer1 in two 8-bit operations
;   T1CON(6)  T1RUN: Timer1 System Clock Status bit
;                      1 = Main system clock is derived from Timer1 oscillator
;                      0 = Main system clock is derived from another source
;   T1CON(5-4)T1CKPS<1:0>: Timer1 Input Clock Prescale Select bits
;                      11 = 1:8 Prescale value
;                      10 = 1:4 Prescale value
;                      01 = 1:2 Prescale value
;                      00 = 1:1 Prescale value
;   T1CON(3)  T1OSCEN: Timer1 Oscillator Enable bit
;                      1 = Timer1 oscillator is enabled
;                      0 = Timer1 oscillator is shut off
;                        The oscillator inverter and feedback resistor are turned off to eliminate power drain.
;   T1CON(2)  T1SYNC: Timer1 External Clock Input Synchronization Select bit
;                      When TMR1CS = 1:
;                         1 = Do not synchronize external clock input
;                         0 = Synchronize external clock input
;                      When TMR1CS = 0:
;                         This bit is ignored. Timer1 uses the internal clock when TMR1CS = 0.
;   T1CON(1)  TMR1CS: Timer1 Clock Source Select bit
;                      1 = External clock from the T13CKI pin (on the rising edge)
;                      0 = Internal clock (FOSC/4)
;   T1CON(0)  bit 0 TMR1ON: Timer1 On bit
;                      1 = Enables Timer1
;                      0 = Stops Timer1
; *******************************************************
	MOVLW	B'10110001'	; 16-bit Read/Write Mode, 1:8 Prescale value
	MOVWF	T1CON

; *******************************************************
; 2.Define TMR1 Register
;    Caution(16-bit Read/Write Mode) !!!!:
;    (a)Writing to TMR1H does not directly affect Timer1.
;       Instead, the high byte of Timer1 is updated with the contents of TMR1H when a write occurs to TMR1L.
;       This allows all 16 bits of Timer1 to be updated at once.
;    (b)A read from TMR1L will load the contents of the high byte of Timer1 into the Timer1 high byte buffer. 
;       This provides the user with the ability to accurately read all 16 bits of Timer1 without the need to 
;       determine whether a read of the high byte, followed by a read of the low byte, has become invalid due 
;       to a rollover or carry between reads.
; *******************************************************
;   TMR1 data ( OSC:12MHz, 4X PLLON, 1:8 Prescale value, 0.01[S];100Hz )
;     10mS(100Hz): 12MHz * 4(PLLON) / 4(PIC) / 8(Prescale) / 100(100Hz)==> 0d15,000(Count) ==> 0x3A98(Count)
;     TMR1 = 0xFFFF - 0x3A98 ==> 0xC567

	MOVLW	H'C5'
	MOVWF	TMR1H
	MOVLW	H'67'
	MOVWF	TMR1L


; *******************************************************
; 3.Timer
; *******************************************************
	BCF	PIR1,TMR1IF
Timer_1
	BTFSS	PIR1,TMR1IF
	GOTO	Timer_1

	RETURN

	END