參數(shù)資料
型號(hào)： PIC16CR77-I/ML
廠商： Microchip Technology
文件頁數(shù)： 28/172頁
文件大?。?/td> 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(cè)/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 33
程序存儲(chǔ)器容量： 14KB（8K x 14）
程序存儲(chǔ)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 121
PIC18F2220/2320/4220/4320
12.0 TIMER1 MODULE
The Timer1 module timer/counter has the following
features:
16-bit timer/counter (two 8-bit registers: TMR1H
and TMR1L)
Readable and writable (both registers)
Internal or external clock select
Interrupt-on-overflow from FFFFh to 0000h
Reset from CCP module Special Event Trigger
Status of system clock operation
Figure 12-1 is a simplified block diagram of the Timer1
module.
Register 12-1 details the Timer1 Control register. This
register controls the operating mode of the Timer1
module and contains the Timer1 Oscillator Enable bit
(T1OSCEN). Timer1 can be enabled or disabled by
setting or clearing control bit, TMR1ON (T1CON<0>).
The Timer1 oscillator can be used as a secondary clock
source in power-managed modes. When the T1RUN bit
is set, the Timer1 oscillator is providing the system clock.
If the Fail-Safe Clock Monitor is enabled and the Timer1
oscillator fails while providing the system clock, polling
the T1RUN bit will indicate whether the clock is being
provided by the Timer1 oscillator or another source.
Timer1 can also be used to provide Real-Time Clock
(RTC) functionality to applications with only a minimal
addition of external components and code overhead.
REGISTER 12-1:
T1CON: TIMER1 CONTROL REGISTER
R/W-0
R-0
R/W-0
RD16
T1RUN
T1CKPS1
T1CKPS0
T1OSCEN
T1SYNC
TMR1CS
TMR1ON
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 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
bit 6
T1RUN: Timer1 System Clock Status bit
1 = Device clock is derived from Timer1 oscillator
0 = Device clock is derived from another source
bit 5-4
T1CKPS1:T1CKPS0: 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
bit 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.
bit 2
T1SYNC: Timer1 External Clock Input Synchronization Select bit
When TMR1CS = 1 (External Clock):
1 = Do not synchronize external clock input
0 = Synchronize external clock input
When TMR1CS = 0 (Internal Clock):
This bit is ignored. Timer1 uses the internal clock when TMR1CS = 0.
bit 1
TMR1CS: Timer1 Clock Source Select bit
1 = External clock from RC0/T1OSO/T13CKI pin (on the rising edge)
0 = Internal clock (FOSC/4)
bit 0
TMR1ON: Timer1 On bit
1 = Enables Timer1
0 = Stops Timer1
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