EFM32TG210F32 Energy Micro, EFM32TG210F32 Datasheet - Page 256

• 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

17.3.2.7.1 2x Count Mode
2010-12-21 - d0034_Rev0.90
Figure 17.20. TIMER Up/Down-count PWM Generation
TIMER Up/Down-count PWM Resolution Equation
The PWM frequency is given by Equation 17.10 (p. 256) :
TIMER Up/Down-count PWM Frequency Equation
The high duty cycle is given by Equation 17.11 (p. 256)
TIMER Up/Down-count Duty Cycle Equation
When the Timer is set in 2x mode, the TIMER will count up/down by two. This will in effect make any
odd Top value be rounded down to the closest even number. Similarly, any odd CC value will generate
a match on the closest lower even value as shown in Figure 17.21 (p. 256)
Figure 17.21. TIMER CC out in 2x mode
The mode is enabled by setting the X2CNT field in TIMERn_CTRL register. The intended use of the
2x mode is to generate 2x PWM frequency when the Compare/Capture channel is put in PWM mode.
Since the PWM output is updated on both edges of the clock, frequency prescaling will result in incorrect
result in this mode. The PWM resolution (in bits) is then given by Equation 17.12 (p. 256) .
TIMER 2x PWM Resolution Equation
The PWM frequency is given by Equation 17.7 (p. 255) :
TIMERn_CCx_CCV
CC Out
Com pare m atch
Clock
TIMERn_TOP
Buffer update
TIMn_CCx
Overflow
Top = 5
CC = 1
0
0
f
PWM
2
up/down
R
4
R
PWM
PWM
= f
DS
2
2xmode
HFPERCLK
up/down
up/down
= log(TOP/2+1)/log(2)
0
= log(TOP+1)/log(2)
= CCVx/TOP
/ ( 2^(PRESC+1) x TOP)
2
...the world's most energy friendly microcontrollers
256
4
Top = 5
CC = 2
0
2
4
www.energymicro.com
2
0
2
(17.10)
(17.11)
(17.12)
(17.9)
4