EFM32TG210F32 Energy Micro, EFM32TG210F32 Datasheet - Page 283

• Manufacturer Part Number: EFM32TG210F32
• Description: MCU 32BIT 32KB FLASH 32-QFN
• Manufacturer: Energy Micro
• Series: Tiny Geckor

Specifications of EFM32TG210F32

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 32MHz
• Connectivity: EBI/EMI, I²C, IrDA, SmartCard, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.8 V
• Data Converters: A/D 4x12b, D/A 1x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-VQFN Exposed Pad
• Processor Series: EFM32
• Core: ARM Cortex-M3
• Data Bus Width: 32 bit
• Data Ram Size: 32 KB
• Interface Type: UART, I2C, SPI
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 1
• Operating Supply Voltage: 1.8 V to 3.8 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Processor To Be Evaluated: EFM32TG210
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

19.3.3.2.2 One-shot Mode
2010-12-21 - d0034_Rev0.90
Figure 19.2. LETIMER State Machine for Free-running Mode
Note that the CLEAR command bit in LETIMERn_CMD always has priority over other changes to
LETIMERn_CNT. When the clear command is used, LETIMERn_CNT is set to 0 and an underflow
event will not be generated when LETIMERn_CNT wraps around to the top value or 0xFFFF. Since
no underflow event is generated, no output action is performed. LETIMERn_REP0, LETIMERn_REP1,
LETIMERn_COMP0 and LETIMERn_COMP1 are also left untouched.
The one-shot repeat mode is the most basic repeat mode. In this mode, the repeat register
LETIMERn_REP0 is decremented every time the timer underflows, and the timer stops when
LETIMERn_REP0 goes from 1 to 0. In this mode, the timer counts down LETIMERn_REP0 times, i.e.
the timer underflows LETIMERn_REP0 times.
Note
LETIMERn_REP0 can be written while the timer is running to allow the timer to run for longer periods
at a time without stopping. Figure 19.3 (p. 284) .
(RUNNING or START)
and ! STOP
CNT = = 0
Note that write operations to LETIMERn_REP0 have priority over the decrementation
operation. So if LETIMERn_REP0 is assigned a new value in the same cycle it was
supposed to be decremented, it is assigned the new value instead of being decremented.
YES
Wait for positive clock edge
YES
NO
NO
CNT = CNT - 1
CNT = TOP*
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If (STOP)
Else if (START)
End if
START = 0
STOP = 0
RUNNING = 0
RUNNING = 1
If (COMP0TOP)
Else
TOP*
TOP* = COMP0
TOP* = 0xFFFF
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