- 您现在的位置：买卖IC网 > Sheet目录323 > EFM32G-DK3550 (Energy Micro)KIT DEVELOPMENT EFM32 GECKO
...the world's most energy friendly microcontrollers
? Repeat done
? Optionally runs during debug
21.3 Functional Description
An overview of the LETIMER module is shown in Figure 21.1 (p. 288) . The LETIMER is a
16-bit down-counter with two compare registers, LETIMERn_COMP0 and LETIMERn_COMP1. The
LETIMERn_COMP0 register can optionally act as a top value for the counter. The repeat counter
LETIMERn_REP0 allows the timer to count a specified number of times before it stops. Both the
LETIMERn_COMP0 and LETIMERn_REP0 registers can be double buffered by the LETIMERn_COMP1
and LETIMERn_REP1 registers to allow continuous operation. The timer can generate a single pin
output, or two linked outputs.
Figure 21.1. LETIMER Overview
LETIMER Control
and Status
COMP1
(Top Buffer)
Update
COMP0
(Top)
Top load
logic
=
=
COMP1 Match
(COMP1 interrupt flag)
COMP0 Match
(COMP0 interrupt flag)
RTC event
SW
Start
Reload
Underflow
(UF interrupt flag)
LFACLK LETIMERn
CNT (Counter)
Stop
= 0
0
Pulse
Control
Pulse
Control
pin
ctrl
pin
ctrl
LETn_O0
LETn_O1
REP0
(Repeat)
=1
REP0 Zero
(REP0 interrupt flag)
Buffer
Written
Update
Repeat
load logic
REP1
(Repeat Buffer)
=1
REP1 Zero
(REP1 interrupt flag)
21.3.1 Timer
The timer is started by setting command bit START in LETIMERn_CMD, and stopped by setting the
STOP command bit in the same register. RUNNING in LETIMERn_STATUS is set as long as the timer is
running. The timer can also be started on external signals, such as a compare match from the Real Time
Counter. If START and STOP are set at the same time, STOP has priority, and the timer will be stopped.
The timer value can be read using the LETIMERn_CNT register. The value cannot be written, but it
can be cleared by setting the CLEAR command bit in LETIMERn_CMD. If the CLEAR and START
commands are issued at the same time, the timer will be cleared, then start counting at the top value.
21.3.2 Compare Registers
The LETIMER has two compare match registers, LETIMERn_COMP0 and LETIMERn_COMP1.
Each of these compare registers are capable of generating an interrupt when the counter value
2011-04-12 - d0001_Rev1.10
288
www.energymicro.com
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
EFM32GG-STK3700
KIT STARTER GIANT GECKO
EFM32LG-DK3650
KIT DEV EFM32 LEOPARD GECKO
EK-K7-KC705-CES-G-J
KINTEX-7 FPGA KC705 EVAL KIT
EK-S6-SP601-G
KIT EVAL SPARTAN 6 SP601
EK-S6-SP605-G
KIT EVAL SPARTAN 6 SP605
EK-V6-ML631-G-J
VIRTEX-6 HXT FPGA ML631 EVAL KIT
EK-V7-VC707-CES-G
VIRTEX-7 VC707 EVAL KIT
EK-Z7-ZC702-CES-G
ZYNQ-7000 EPP ZC702 EVAL KIT
相关代理商/技术参数
EFM32GG230F1024
功能描述:ARM微控制器 - MCU 1024KB FL 128KB RAM
RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 处理器系列:STM32F373xx 数据总线宽度:32 bit 最大时钟频率:72 MHz 程序存储器大小:256 KB 数据 RAM 大小:32 KB 片上 ADC:Yes 工作电源电压:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LQFP-48 安装风格:SMD/SMT
EFM32GG230F1024G-E-QFN64R
功能描述:IC MCU 32BIT 1MB FLASH 64QFN 制造商:silicon labs 系列:Giant Gecko 包装:剪切带（CT） 零件状态:在售 核心处理器:ARM? Cortex?-M3 核心尺寸:32-位 速度:48MHz 连接性:I2C，IrDA，智能卡，SPI，UART/USART 外设:欠压检测/复位，DMA，POR，PWM，WDT I/O 数:56 程序存储容量:1MB（1M x 8） 程序存储器类型:闪存 EEPROM 容量:- RAM 容量:128K x 8 电压 - 电源（Vcc/Vdd）:1.98 V ~ 3.8 V 数据转换器:A/D 8x12b，D/A 2x12b 振荡器类型:内部 工作温度:-40°C ~ 85°C（TA） 封装/外壳:64-VFQFN 裸露焊盘 供应商器件封装:64-QFN（9x9） 标准包装:1
EFM32GG230F1024-QFN64
制造商:Energy Micro AS 功能描述:GIANT GECKO MCU - Cut TR (SOS) 制造商:Energy Micro 功能描述:GIANT GECKO MCU 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 1MB FLASH 64QFN
EFM32GG230F1024-QFN64T
制造商:Energy Micro AS 功能描述:GIANT GECKO MCU - Trays
EFM32GG230F1024-QFN64-T
制造商:Energy Micro AS 功能描述:IC MCU 32BIT 1MB FLASH 64QFN
EFM32-GG230F1024-SK
制造商:Energy Micro AS 功能描述:GIANT GECKO SAMPLE KIT - Bulk
EFM32GG230F1024-T
制造商:Energy Micro AS 功能描述:IC MCU 32BIT 1MB FLASH 64QFN
EFM32GG230F512
功能描述:ARM微控制器 - MCU 512KB FL 128KB RAM
RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 处理器系列:STM32F373xx 数据总线宽度:32 bit 最大时钟频率:72 MHz 程序存储器大小:256 KB 数据 RAM 大小:32 KB 片上 ADC:Yes 工作电源电压:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LQFP-48 安装风格:SMD/SMT