EFM32G200F64 Energy Micro, EFM32G200F64 Datasheet - Page 426

• Manufacturer Part Number: EFM32G200F64
• Description: MCU 32BIT 64KB FLASH 32-QFN
• Manufacturer: Energy Micro
• Series: Geckor

Specifications of EFM32G200F64

• 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: 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 4x12b, D/A 1x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-VQFN Exposed Pad
• Processor Series: EFM32G200
• 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: 24
• Number Of Timers: 2
• 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

29.3.6 VBOOST Control
29.3.7 Framerate
29.3.7.1 Clock Selection and Prescaler
29.3.7.2 Framerate Division Register
2010-09-06 - d0001_Rev1.00
The boost voltage is configurable. By programming the VBLEV bits in LCD_DISPCTRL, the boost voltage
level can be adjusted between 3.0V and 3.6V.
The boost circuit will use an update frequency given by the VBFREQ bits in CMU_LCDCTRL, see
Table 29.8 (p. 426) ). It is possible to adjust the frequency to optimize performance for all kinds of LCD
panels (large capacitors may require less frequent updates, while small capacitors may require more
frequent updates). A lower update frequency would in general lead to smaller current consumption.
Table 29.8. LCD V
It is important to choose the correct framerate for the LCD display. Normally, the framerate should be
between 30 and 100 Hz. A framerate below 30 Hz may lead to flickering, while a framerate above 100
Hz may lead to ghostering and unnecessarily high power consumption.
The LFACLK is prescaled to LFACLK
• LFCLK16: LFACLK
• LFCLK32: LFACLK
• LFCLK64: LFACLK
• LFCLK128: LFACLK
In addition to selecting the correct prescaling, the clock source can be selected in the CMU.
To use this module, the LE interface clock must be enabled in CMU_HFCORECLKEN0, in addition to
the module clock.
The framerate is set in the CMU by programming the framerate division bits FDIV in CMU_LCDCTRL.
This setting should not be changed while the LCD driver is running. The equation for calculating the
resulting framerate is given from Equation 29.1 (p. 426)
LCD Framerate Calculation
VBFREQ
000
001
010
011
100
101
110
111
V
LFACLK
LFACLK/2
LFACLK/4
LFACLK/8
LFACLK/16
LFACLK/32
LFACLK/64
LFACLK/128
BOOST
BOOST
LCDpre
LCDpre
LCDpre
LCDpre
Update Frequency
Frequency
LFACLK
= LFACLK/16
= LFACLK/32
= LFACLK/64
= LFACLK/128
LCD
LCDpre
= LFACLK
in the CMU. The available prescaler settings are:
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426
LCDpre
/(1 + FDIV)
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(29.1)