参数资料
型号: PIC16CR76-I/SS
厂商: Microchip Technology
文件页数: 119/172页
文件大小: 0K
描述: IC PIC MCU 8KX14 28SSOP
标准包装: 47
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: 22
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 5x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
PIC16CR7X
DS21993C-page 48
2007 Microchip Technology Inc.
6.1
Timer1 Operation in Timer Mode
Timer mode is selected by clearing the TMR1CS
(T1CON<1>) bit. In this mode, the input clock to the
timer is FOSC/4. The synchronize control bit T1SYNC
(T1CON<2>) has no effect, since the internal clock is
always in sync.
6.2
Timer1 Counter Operation
Timer1 may operate in Asynchronous or Synchronous
mode, depending on the setting of the TMR1CS bit.
When Timer1 is being incremented via an external
source, increments occur on a rising edge. After Timer1
is enabled in Counter mode, the module must first have
a falling edge before the counter begins to increment.
FIGURE 6-1:
TIMER1 INCREMENTING EDGE
6.3
Timer1 Operation in Synchronized
Counter Mode
Counter mode is selected by setting bit TMR1CS. In
this mode, the timer increments on every rising edge of
clock input on pin RC1/T1OSI/CCP2, when bit
T1OSCEN is set, or on pin RC0/T1OSO/T1CKI, when
bit T1OSCEN is cleared.
If T1SYNC is cleared, then the external clock input is
synchronized with internal phase clocks. The synchro-
nization is done after the prescaler stage. The
prescaler stage is an asynchronous ripple counter.
In this configuration, during Sleep mode, Timer1 will not
increment even if the external clock is present, since
the synchronization circuit is shut-off. The prescaler,
however, will continue to increment.
FIGURE 6-2:
TIMER1 BLOCK DIAGRAM
T1CKI
(Default high)
T1CKI
(Default low)
Note: Arrows indicate counter increments.
TMR1H
TMR1L
T1OSC
T1SYNC
TMR1CS
T1CKPS1:T1CKPS0
Q Clock
T1OSCEN
Enable
Oscillator(1)
FOSC/4
Internal
Clock
TMR1ON
On/Off
Prescaler
1, 2, 4, 8
Synchronize
det
1
0
1
Synchronized
Clock Input
2
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2(2)
Note
1: When the T1OSCEN bit is cleared, the inverter is turned off. This eliminates power drain.
2: For the PIC16CR73/76, the Schmitt Trigger is not implemented in External Clock mode.
Set Flag bit
TMR1IF on
Overflow
TMR1
(2)
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