Energy micro EFM32 Giant Gecko Starter Kit, Руководство пользователя

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...the world's most energy friendly microcontrollers
2012-05-31 - t0014_0.11 7
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5 Peripherals
The starter kit has a set of peripherals that showcase some of the features of the EFM32 Giant Gecko
microcontroller.
Be aware that most EFM32 I/O routed to peripherals are also routed to the breakout pads. This must be
taken into consideration when using the breakout pads for your application.
5.1 Push Buttons and LEDs
The kit has two user push buttons marked PB0 and PB1. They are connected to the EFM32, and are
debounced by RC filters with a time constant of 1ms. The buttons are connected to pins PB9 and PB10.
In addition to the two push buttons, the kit also features two yellow LEDs marked LED0 and LED1, that
are controlled by GPIO pins on the EFM32. The LEDs are connected to pins PE2 and PE3 in an active-
high configuration.
Figure 5.1. Buttons/LEDs
User But t ons
& LEDs
UIF_LED0
UIF_LED1
UIF_PB0
UIF_PB1
PB9
PB10
PE2
PE3
EFM32 MCU
5.2 LCD
A 28-pin Energy Micro LCD display is connected to the EFM32. The LCD has 8 common lines and 20
segment lines, giving a total of 160 segments in 8-plexed mode. These lines are not shared on the
breakout pads.
Figure 5.2. 160 Segment LCD
PB[ 2..0]
PA[ 11..7]
EFM32 MCU
LCD_SEG[ 39..35]
LCD_SEG[ 34..32]
LCD_SEG[ 31..28]
LCD_SEG[ 19..12]
LCD_COM[ 7..4]
LCD_COM[ 3..0]
PD[ 12..9]
PA[ 6..0] , PA15
PB[ 6..3]
PE[ 7..4]
8x20 Segm ent LCD
Capacitors for the EFM32 Giant Gecko LCD boost function are also available on the EFM32GG-
STK3700.
5.3 Capacitive Touch Slider
A touch slider utilizing the capacitive touch capability is available. It is placed beneath the two push
buttons on the kit. The slider interpolates 4 separate pads to find the exact position of a finger. For low
power operation, the touch slider can be used together with LESENSE to continuously scan all 4 pads,
using LESENSE channels 8 to 11.