參數(shù)資料
型號: PIC16CR77-I/ML
廠商: Microchip Technology
文件頁數(shù): 32/172頁
文件大小: 0K
描述: IC PIC MCU 8KX14 44QFN
標(biāo)準(zhǔn)包裝: 45
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 33
程序存儲器容量: 14KB(8K x 14)
程序存儲器類型: ROM
RAM 容量: 368 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-VQFN 裸露焊盤
包裝: 管件
2007 Microchip Technology Inc.
DS39599G-page 125
PIC18F2220/2320/4220/4320
EXAMPLE 12-1:
IMPLEMENTING A REAL-TIME CLOCK USING A TIMER1 INTERRUPT SERVICE
TABLE 12-2:
REGISTERS ASSOCIATED WITH TIMER1 AS A TIMER/COUNTER
RTCinit
MOVLW
0x80
; Preload TMR1 register pair
MOVWF
TMR1H
; for 1 second overflow
CLRF
TMR1L
MOVLW
b’00001111’
; Configure for external clock,
MOVWF
T1OSC
; Asynchronous operation, external oscillator
CLRF
secs
; Initialize timekeeping registers
CLRF
mins
;
MOVLW
.12
MOVWF
hours
BSF
PIE1, TMR1IE
; Enable Timer1 interrupt
RETURN
RTCisr
BSF
TMR1H,7
; Preload for 1 sec overflow
BCF
PIR1,TMR1IF
; Clear interrupt flag
INCF
secs,F
; Increment seconds
MOVLW
.59
; 60 seconds elapsed?
CPFSGT secs
RETURN
; No, done
CLRF
secs
; Clear seconds
INCF
mins,F
; Increment minutes
MOVLW
.59
; 60 minutes elapsed?
CPFSGT mins
RETURN
; No, done
CLRF
mins
; clear minutes
INCF
hours,F
; Increment hours
MOVLW
.23
; 24 hours elapsed?
CPFSGT hours
RETURN
; No, done
MOVLW
.01
; Reset hours to 1
MOVWF
hours
RETURN
; Done
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
Value on
all other
Resets
INTCON
GIE/GIEH PEIE/GIEL TMR0IE
INT0IE
RBIE
TMR0IF
INT0IF
RBIF
0000 000x 0000 000u
PIR1
PSPIF(1)
ADIF
RCIF
TXIF
SSPIF
CCP1IF
TMR2IF
TMR1IF 0000 0000 0000 0000
PIE1
PSPIE(1)
ADIE
RCIE
TXIE
SSPIE
CCP1IE
TMR2IE
TMR1IE 0000 0000 0000 0000
IPR1
PSPIP(1)
ADIP
RCIP
TXIP
SSPIP
CCP1IP
TMR2IP
TMR1IP 1111 1111 1111 1111
TMR1L
Timer1 Low Byte Register
xxxx xxxx uuuu uuuu
TMR1H
Timer1 High Byte Register
xxxx xxxx uuuu uuuu
T1CON
RD16
T1RUN
T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON 0000 0000 u0uu uuuu
Legend: x = unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used by the Timer1 module.
Note 1: The PSPIF, PSPIE and PSPIP bits are reserved on the PIC18F2X20 devices; always maintain these bits clear.
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