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参数资料
型号： PIC16CR77T-I/PT
厂商： Microchip Technology
文件页数： 37/172页
文件大小： 0K
描述： IC PIC MCU 8KX14 44TQFP
标准包装： 1,200
系列： PIC® 16C
核心处理器： PIC
芯体尺寸： 8-位
速度： 20MHz
连通性： I²C，SPI，UART/USART
外围设备： 欠压检测/复位，POR，PWM，WDT
输入/输出数： 33
程序存储器容量： 14KB（8K x 14）
程序存储器类型： ROM
RAM 容量： 368 x 8
电压 - 电源 (Vcc/Vdd)： 2 V ~ 5.5 V
数据转换器： A/D 8x8b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 44-TQFP
包装： 带卷 (TR)
2007 Microchip Technology Inc.
DS39599G-page 129
PIC18F2220/2320/4220/4320
14.0 TIMER3 MODULE
The Timer3 module timer/counter has the following
features:
16-bit timer/counter (two 8-bit registers: TMR3H
and TMR3L)
Readable and writable (both registers)
Internal or external clock select
Interrupt-on-overflow from FFFFh to 0000h
Reset from CCP module trigger
Figure 14-1 is a simplified block diagram of the Timer3
module.
Register 14-1 shows the Timer3 Control register. This
register controls the operating mode of the Timer3
module and sets the CCP clock source.
Register 12-1 shows the Timer1 Control register. This
register controls the operating mode of the Timer1
module, as well as contains the Timer1 Oscillator
Enable bit (T1OSCEN) which can be a clock source for
Timer3.
REGISTER 14-1:
T3CON: TIMER3 CONTROL REGISTER
R/W-0
RD16
T3CCP2
T3CKPS1
T3CKPS0
T3CCP1
T3SYNC
TMR3CS
TMR3ON
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 Timer3 in one 16-bit operation
0 = Enables register read/write of Timer3 in two 8-bit operations
bit 6, 3
T3CCP2:T3CCP1: Timer3 and Timer1 to CCPx Enable bits
1x = Timer3 is the capture/compare clock source for both CCP modules
01 = Timer3 is the capture/compare clock source for CCP2;
Timer1 is the capture/compare clock source for CCP1
00 = Timer1 is the capture/compare clock source for both CCP modules
bit 5-4
T3CKPS1:T3CKPS0: Timer3 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 2
T3SYNC: Timer3 External Clock Input Synchronization Control bit
(Not usable if the device clock comes from Timer1/Timer3.)
When TMR3CS = 1:
1 = Do not synchronize external clock input
0 = Synchronize external clock input
When TMR3CS = 0:
This bit is ignored. Timer3 uses the internal clock when TMR3CS = 0.
bit 1
TMR3CS: Timer3 Clock Source Select bit
1 = External clock input from Timer1 oscillator or T13CKI (on the rising edge after the first falling edge)
0 = Internal clock (FOSC/4)
bit 0
TMR3ON: Timer3 On bit
1 = Enables Timer3
0 = Stops Timer3
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