EFM32TG210F32 Energy Micro, EFM32TG210F32 Datasheet - Page 255

• 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

17.3.2.6.1 2x Count Mode
17.3.2.7 Up/Down-count (Dual-slope) PWM
2010-12-21 - d0034_Rev0.90
The PWM frequency is given by Equation 17.4 (p. 255) :
TIMER Up-count PWM Frequency Equation
The high duty cycle is given by Equation 17.5 (p. 255)
TIMER Up-count Duty Cycle Equation
When the Timer is set in 2x mode, the TIMER will count up 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 17.19 (p. 255)
Figure 17.19. 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 17.6 (p. 255) .
TIMER 2x PWM Resolution Equation
The PWM frequency is given by Equation 17.7 (p. 255) :
TIMER 2x Mode PWM Frequency Equation( Up-count)
The high duty cycle is given by Equation 17.8 (p. 255)
TIMER 2x Mode Duty Cycle Equation
If the counter is set to up-down count and the Compare/Capture channel is put in PWM mode, dual
slope PWM output will be generated by Figure 17.20 (p. 256) .The resolution (in bits) is given by
Equation 17.9 (p. 256) .
CC Out
Clock
Top = 5
CC = 1
0
f
PWM
2
f
PWM
up/down
R
4
2xmode
PWM
R
= f
PWM
DS
HFPERCLK
0
= 2 x f
2xmode
DS
2xmode
up
up
= log(TOP+1)/log(2)
= log(TOP/2+1)/log(2)
2
HFPERCLK
= CCVx/TOP
/ ( 2^PRESC x (TOP + 1)
= CCVx/TOP
4
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255
/ floor(TOP/2)+1
0
Top = 5
CC = 2
0
2
4
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0
2
4
(17.3)
(17.4)
(17.5)
(17.6)
(17.7)
(17.8)
0