2010 Microchip Technology Inc.
Preliminary
DS41350E-page 105
PIC18F/LF1XK50
11.0
TIMER1 MODULE
The Timer1 timer/counter module incorporates the
following features:
Software selectable operation as a 16-bit timer or
counter
Readable and writable 8-bit registers (TMR1H
and TMR1L)
Selectable internal or external clock source and
Timer1 oscillator options
Interrupt-on-overflow
Reset on CCP Special Event Trigger
Device clock status flag (T1RUN)
A simplified block diagram of the Timer1 module is
shown in Figure 11-1. A block diagram of the module’s
operation in Read/Write mode is shown in Figure 11-2.
The module incorporates its own low-power oscillator
to provide an additional clocking option. The Timer1
oscillator can also be used as a low-power clock source
for the microcontroller in power-managed operation.
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.
Timer1 is controlled through the T1CON Control
register (Register 11-1). It also contains the Timer1
Oscillator Enable bit (T1OSCEN). Timer1 can be
enabled or disabled by setting or clearing control bit,
TMR1ON of the T1CON register.
REGISTER 11-1:
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
= Main system clock is derived from Timer1 oscillator
0
= Main system clock is derived from another source
bit 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
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:
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.
bit 1
TMR1CS: Timer1 Clock Source Select bit
1
= External clock from the T13CKI pin (on the rising edge)
0
= Internal clock (FOSC/4)
bit 0
TMR1ON: Timer1 On bit
1
= Enables Timer1
0
= Stops Timer1
相关PDF资料
PIC24F08KL302-I/ML IC MCU 16BIT 8KB FLASH 28-QFN
PIC24F08KL302-I/MQ IC MCU 16BIT 8KB FLASH 28-QFN
PIC16LF627A-I/P IC MCU FLASH 1KX14 EEPROM 18DIP
PIC18F25K20-I/SO IC PIC MCU FLASH 16KX16 28SOIC
PIC24F08KL301-I/SO IC MCU 16BIT 8KB FLASH 20-SOIC
PIC24F04KL101-I/P IC MCU 16BIT 4KB FLASH 20-PDIP
PIC16LC56A-04/SO IC MCU OTP 1KX12 18SOIC
PIC16LF74-I/PTG IC MCU FLASH 4KX14 44TQFP
相关代理商/技术参数
PIC18F14K50T-I/SO 功能描述:8位微控制器 -MCU 16KB Flash 768 RAM15 I/O 10-B ADC USB 2.0 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18F14K50T-I/SS 功能描述:8位微控制器 -MCU 16KB Flash 768 RAM15 I/O 10-B ADC USB 2.0 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18F2220-E/SO 功能描述:8位微控制器 -MCU 4KB 512 RAM 25 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18F2220-E/SP 功能描述:8位微控制器 -MCU 4KB 512 RAM 25 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18F2220-I/SO 功能描述:8位微控制器 -MCU 4KB 512 RAM 25 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18F2220-I/SO 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 18F2220 SOIC28
PIC18F2220-I/SOC03 制造商:Microchip Technology Inc 功能描述:
PIC18F2220-I/SP 功能描述:8位微控制器 -MCU 4KB 512 RAM 25 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT