EFM32G200F64 Energy Micro, EFM32G200F64 Datasheet - Page 195

• 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

16.3.8 IrDA Modulator/ Demodulator
2010-09-06 - d0001_Rev1.00
the other. Separating the interrupts in this way allows different priorities to be set for transmission and
reception interrupts.
The transmission interrupt vector groups the transmission-related interrupts generated by the following
interrupt flags:
• TXC
• TXBL
• TXOF
• CCF
The reception interrupt on the other hand groups the reception-related interrupts, triggered by the
following interrupt flags:
• RXDATAV
• RXFULL
• RXOF
• RXUF
• PERR
• FERR
• MPAF
• SSM
If USART interrupts are enabled, an interrupt will be made if one or more of the interrupt flags in
USART_IF and their corresponding bits in USART_IEN are set.
The IrDA modulator on USART0 implements the physical layer of the IrDA specification, which is
necessary for communication over IrDA. The modulator takes the signal output from the USART module,
and modulates it before it leaves USART0. In the same way, the input signal is demodulated before it
enters the actual USART module. The modulator is only available on USART0, and supports speeds
from 2.4 kbps to 1.152 Mbps.
The data from and to the USART is represented in a NRZ (Non Return to Zero) format, where the signal
value is at the same level through the entire bit period. For IrDA, the required format is RZI (Return to
Zero Inverted), a format where a “1” is signalled by holding the line low, and a “0” is signalled by a short
high pulse. An example is given in Figure 16.16 (p. 195) .
Figure 16.16. USART Example RZI Signal for a given Asynchronous USART Frame
The IrDA module is enabled by setting IREN. The USART transmitter output and receiver input is then
routed through the IrDA modulator.
The width of the pulses generated by the IrDA modulator is set by configuring IRPW in
USARTn_IRCTRL. Four pulse widths are available, each defined relative to the configured bit period
as listed in Table 16.9 (p. 196) .
USART
(NRZ)
(RZI)
IrDA
Idle
S
0
1
2
3
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