- 您现在的位置：买卖IC网 > Sheet目录1168 > 71M6521FE-DB (Maxim Integrated Products)BOARD DEMO FOR 71M6521FE
71M6521DE/DH/FE Data Sheet
Timer 1
Mode 0
Mode 1
Mode 2
Timer 0 - mode 0
Timer 0 - mode 1
Timer 0 - mode 2
YES
YES
Not allowed
YES
YES
Not allowed
YES
YES
YES
Table 24: Timer Modes
Timer/Counter Mode Control register ( PCON ):
MSB
LSB
SMOD
--
--
--
--
--
--
--
Table 25: The PCON Register
The SMOD bit in the PCON register doubles the baud rate when set.
Bit
PCON.7
Symbol
SMOD
Function
Baud rate control.
Table 26: PCON Register Bit Description
WD Timer (Software Watchdog Timer)
The software watchdog timer is a 16-bit counter that is incremented once every 24 or 384 clock cycles. After a reset,
the watchdog timer is disabled and all registers are set to zero. The watchdog consists of a 16-bit counter (WDT), a
reload register ( WDTREL ), prescalers (by 2 and by 16), and control logic. Once the watchdog is started, it cannot be
stopped unless the internal reset signal becomes active.
Note: It is recommended to use the hardware watchdog timer instead of the software watchdog
timer.
WD Timer Start Procedure: The WDT is started by setting the SWDT flag. When the WDT register enters the state
0x7CFF, an asynchronous WDTS signal will become active. The signal WDTS sets bit 6 in the IP0 register and
requests a reset state. WDTS is cleared either by the reset signal or by changing the state of the WDT timer.
Refreshing the WD Timer: The watchdog timer must be refreshed regularly to prevent the reset request signal from
becoming active. This requirement imposes an obligation on the programmer to issue two instructions. The first
instruction sets WDT and the second instruction sets SWDT. The maximum delay allowed between setting WDT and
SWDT is 12 clock cycles. If this period has expired and SWDT has not been set, the WDT is automatically reset,
otherwise the watchdog timer is reloaded with the content of the WDTREL register and the WDT is automatically
reset. Since the WDT requires exact timing, firmware needs to be designed with special care in order to avoid
unwanted WDT resets. It is strongly discouraged to use the software WDT.
Page: 28 of 107
Rev 3
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
71M6531F-DB
BOARD DEMO 71M6531F
71M6533-DB
BOARD DEMO 71M6533
71M6534H-DB
BOARD DEMO 71M6534H
71M6541F-DB
DEMO BOARD 71M6541F
71M6543F-DB-CT
DEMO BOARD 71M6543F-DB-CT
72-CNV-5
CONVERTER RS-232 TO RS-422 5V
72346-001
72346-1-SCA-II REC
72347-001LF
CONN RECEPT SCA2 20POS VERT PCB
相关代理商/技术参数
71M6521FE-IGT
制造商:Maxim Integrated Products 功能描述:Metering Systems on a Chip - SoC Residential Energy Meter IC
71M6521FE-IGT/F
功能描述:计量片上系统 - SoC Residential Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel
71M6521FE-IGT/F1
功能描述:计量片上系统 - SoC
RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel
71M6521FE-IGTR
制造商:Maxim Integrated Products 功能描述:Metering Systems on a Chip - SoC Residential Energy Meter IC
71M6521FE-IGTR/F
功能描述:计量片上系统 - SoC Residential Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel
71M6521FE-IGTR/F1
功能描述:计量片上系统 - SoC
RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel
71M6521FE-IM
制造商:Maxim Integrated Products 功能描述:Metering Systems on a Chip - SoC Residential Energy Meter IC
71M6521FE-IM/F
功能描述:计量片上系统 - SoC Residential Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel