EFM32G200F64 Energy Micro, EFM32G200F64 Datasheet - Page 177

• 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

16.3.2 Asynchronous Operation
16.3.2.1 Frame Format
2010-09-06 - d0001_Rev1.00
Asynchronous or synchronous mode can be selected by configuring SYNC in USARTn_CTRL. The
options are listed with supported protocols in Table 16.1 (p. 177) . Full duplex and half duplex
communication is supported in both asynchronous and synchronous mode.
Table 16.1. USART Asynchronous vs. Synchronous Mode
Table 16.2 (p. 177) explains the functionality of the different USART pins when the USART operates
in different modes. Pin functionality enclosed in square brackets is optional, and depends on additional
configuration parameters. LOOPBK and MASTER are discussed in Section 16.3.2.5 (p. 185) and
Section 16.3.3.3 (p. 192) respectively.
Table 16.2. USART Pin Usage
The frame format used in asynchronous mode consists of a set of data bits in addition to bits for
synchronization and optionally a parity bit for error checking. A frame starts with one start-bit (S), where
the line is driven low for one bit-period. This signals the start of a frame, and is used for synchronization.
Following the start bit are 4 to 16 data bits and an optional parity bit. Finally, a number of stop-bits, where
the line is driven high, end the frame. An example frame is shown in Figure 16.2 (p. 177) .
Figure 16.2. USART Asynchronous Frame Format
The number of data bits in a frame is set by DATABITS in USARTn_FRAME, see Table 16.3 (p. 178)
, and the number of stop-bits is set by STOPBITS in USARTn_FRAME, see Table 16.4 (p. 178) .
Whether or not a parity bit should be included, and whether it should be even or odd is defined by
PARITY, also in USARTn_FRAME. For communication to be possible, all parties of an asynchronous
transfer must agree on the frame format being used.
SYNC
0
1
SYNC
0
1
1
1
1
1
Stop or idle
LOOPBK
0
1
0
0
1
1
S
Communication Mode
Asynchronous
Synchronous
0
MASTER
x
x
0
1
0
1
1
2
U(S)n_TX
(MOSI)
Data out
Data out/in
Data in
Data out
Data out/in
Data out/in
3
Supported Protocols
RS-232, RS-485 (w/external driver), IrDA, ISO 7816
SPI, MicroWire, 3-wire
4
...the world's most energy friendly microcontrollers
Fram e
177
[ 5]
U(S)n_RX (MISO)
Data in
-
Data out
Data in
-
-
[ 6]
Pin functionality
[ 7]
USn_CLK
-
-
Clock in
Clock out
Clock in
Clock out
[ 8]
[ P]
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Stop
USn_CS
[Driver enable]
[Driver enable]
Slave select
[Auto slave select]
Slave select
[Auto slave select]
Start or idle