EFM32HG321 Datasheet, PDF (6/70 Pages) Silicon Laboratories – Output state retention and wake-up from Shutoff Mode

Preliminary
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2.1.19 Voltage Comparator (VCMP)
The Voltage Supply Comparator is used to monitor the supply voltage from software. An interrupt can
be generated when the supply falls below or rises above a programmable threshold. Response time and
thereby also the current consumption can be configured by altering the current supply to the comparator.
2.1.20 Analog to Digital Converter (ADC)
The ADC is a Successive Approximation Register (SAR) architecture, with a resolution of up to 12 bits
at up to one million samples per second. The integrated input mux can select inputs from 4 external
pins and 6 internal signals.
2.1.21 Current Digital to Analog Converter (IDAC)
The current digital to analog converter can source or sink a configurable constant current, which can
be output on, or sinked from pin or ADC. The current is configurable with several ranges of various
step sizes.
2.1.22 General Purpose Input/Output (GPIO)
In the EFM32HG321, there are 35 General Purpose Input/Output (GPIO) pins, which are divided into
ports with up to 16 pins each. These pins can individually be configured as either an output or input. More
advanced configurations like open-drain, filtering and drive strength can also be configured individually
for the pins. The GPIO pins can also be overridden by peripheral pin connections, like Timer PWM
outputs or USART communication, which can be routed to several locations on the device. The GPIO
supports up to 16 asynchronous external pin interrupts, which enables interrupts from any pin on the
device. Also, the input value of a pin can be routed through the Peripheral Reflex System to other
peripherals.
2.2 Configuration Summary
The features of the EFM32HG321 is a subset of the feature set described in the EFM32HG Reference
Manual. Table 2.1 (p. 6) describes device specific implementation of the features.
Table 2.1. Configuration Summary
Module
Cortex-M0+
DBG
MSC
DMA
RMU
EMU
CMU
WDOG
PRS
USB
I2C0
USART0
USART1
Configuration
Full configuration
Full configuration
Full configuration
Full configuration
Full configuration
Full configuration
Full configuration
Full configuration
Full configuration
Full configuration
Full configuration
Full configuration with IrDA and I2S
Full configuration with I2S and IrDA
Pin Connections
NA
DBG_SWCLK, DBG_SWDIO,
NA
NA
NA
NA
CMU_OUT0, CMU_OUT1
NA
NA
USB_VREGI, USB_VREGO, USB_DM,
USB_DMPU, USB_DP
I2C0_SDA, I2C0_SCL
US0_TX, US0_RX. US0_CLK, US0_CS
US1_TX, US1_RX, US1_CLK, US1_CS
2015-05-06 - EFM32HG321FXX - _Rev0.91
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