EFM32G890F64 Energy Micro, EFM32G890F64 Datasheet - Page 293

• Manufacturer Part Number: EFM32G890F64
• Description: MCU 32BIT 64KB FLASH 112-BGA
• Manufacturer: Energy Micro
• Series: Geckor

Specifications of EFM32G890F64

• 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, LCD, POR, PWM, WDT
• Number Of I /o: 90
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.8 V
• Data Converters: A/D 8x12b, D/A 2x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 112-LFBGA
• Processor Series: EFM32G890
• Core: ARM Cortex-M3
• Data Bus Width: 32 bit
• Data Ram Size: 16 KB
• Interface Type: I2C, UART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 90
• Number Of Timers: 3
• Operating Supply Voltage: 1.8 V to 3.8 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

2010-09-06 - d0001_Rev1.00
are LETIMERn_COMP0+1. Note that the pulse outputs are delayed by one period relative to the toggle
output. The pulses come at the end of their periods.
Figure 21.6. LETIMER Simple Waveforms Output
For the example in Figure 21.7 (p. 293) , the One-shot repeat mode has been selected, and
LETIMERn_REP0 has been written to 3. The resulting behavior is pretty similar to that shown in
Figure 6, but in this case, the timer stops after counting to zero LETIMERn_REP0 times. By using
LETIMERn_REP0 the user has full control of the number of pulses/toggles generated on the output.
Figure 21.7. LETIMER Repeated Counting
Using the Double repeat mode, output can be generated on both the LETIMER outputs. Figure 21.8 (p.
293) shows an example of this. UFOA0 and UFOA1 in LETIMERn_CTRL are configured for pulse
output and the outputs are configured for low idle polarity. As seen in the figure, the number written to
the repeat registers determine the number of pulses generated on each of the outputs.
Figure 21.8. LETIMER Dual Output
LFACLK
LFACLK
UFOA0 = 00
UFOA0 = 01
UFOA0 = 10
Int. flags set
UFOA0 = 00
UFOA0 = 01
UFOA0 = 10
Int. flags set
LETn_O0
LETn_O0
LETn_O0
LETn_O0
LETn_O0
LETn_O0
LETn_O0
LETn_O1
COMP0
LETIMERn
COMP0
LETIMERn
REP0
UFOA0 = 10
UFOA1 = 10
Initial configuration
CNT
Initial configuration
CNT
REP0 = 2
REP1 = 7
START
3
0
3
3
0
3
3
3
3
3
3
2
3
3
2
3
1
3
3
1
UFIF
UFIF
3
0
3
3
0
3
3
2
REP0 = 3
3
3
START
3
2
2
3
2
3
1
2
3
1
UFIF
UFIF
3
0
2
3
0
3
3
1
3
3
3
2
1
3
2
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293
REP0 = 2
REP1 = 3
3
1
1
3
1
REP0IF
UFIF
START
UFIF
3
0
1
3
0
Stop
3
0
0
3
3
3
0
0
3
2
3
0
0
3
1
UFIF
3
0
0
3
0
3
0
0
3
3
3
0
0
3
2
3
0
0
3
1
UFIF
3
0
0
3
0
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3
0
3
3
0
3
0
3
2
0
3
1
3
0
0
UFIF
3
0
3
0
0