EFM32G200F64 Energy Micro, EFM32G200F64 Datasheet - Page 428

• 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

2010-09-06 - d0001_Rev1.00
• Every frame
• Every second frame
• Every fourth frame
• Every eight frame
This is controlled by the FCPRESC in LCD_BACTRL, see Table 29.11 (p. 428)
Table 29.11. FCPRESC
The top value for the Frame Counter is set by FCTOP in LCD_BACTRL. Every time the frame counter
reaches zero, it is reloaded with the top value, and at the same time an event, which can cause an
interrupt, data update, blink, or an animation state transition is triggered.
LCD Event Frequency Equation
The above equation shows how to set-up the LCD event frequency. In this example, the framerate is
64Hz, and the LCD event frequency should be set-up to 2 seconds.
Example 29.1. LCD Event Frequency Example
• Write FCPRESC to 3 => CLK
• Write FCTOP to 15 => CLK
If higher resolution is required, configure a lower prescaler value and increase the FCPRESC in
LCD_BACTRL accordingly (e.g. FCPRESC = 2, FCTOP = 31).
Figure 29.43. LCD Clock System in LCD Driver
CMU
FCPRESC
00
01
10
11
LFRCO
LFXO
LFACLK
Mode
Div1
Div2
Div4
Div8
div128
div16
div32
div64
CLK
CMU_LFAPRESC0
EVENT
EVENT
LCD in
FC
div2
div4
div6
div8
LFACLK
= 8Hz (0.125 seconds)
= 0.5Hz (2 seconds)
= CLK
LCDpre
quadruplex
static
duplex
triplex
Description
CLK
CLK
CLK
CLK
FC
FDIV[ 2:0]
/(1 + FCTOP[5:0]) Hz
Counter
LCD_DISPCTRL
FRAME
FRAME
FRAME
FRAME
...the world's most energy friendly microcontrollers
MUX in
428
/1
/2
/4
/8
LFACLK
LCD
div1
div2
div4
div8
General equation
LCD_BACTRL
FCPRESC in
CLK
CLK
FC
FC
www.energymicro.com
= CLK
FCTOP[ 5:0]
LCD Fram e
Counter
FRAME
/2
FCPRESC
CLK
CLK
(29.2)
FRAME
EVENT