EFM32G200F16 Energy Micro, EFM32G200F16 Datasheet - Page 307

• Manufacturer Part Number: EFM32G200F16
• Description: MCU 32BIT 16KB FLASH 32-QFN
• Manufacturer: Energy Micro
• Series: Geckor

Specifications of EFM32G200F16

• 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: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K 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: 8 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

22 PCNT - Pulse Counter
22.1 Introduction
22.2 Features
22.3 Functional Description
2010-09-06 - d0001_Rev1.00
The Pulse Counter (PCNT) can be used for counting pulses on a single input or to decode quadrature
encoded inputs. It runs off either the internal LFACLK or the PCNTn_S0IN pin as external clock source.
The module may operate in energy mode EM0 – EM3.
• 8-bit counter with double-buffered reload register
• Single input oversampling up/down counter mode (EM0-EM2)
• Externally clocked single input pulse up/down counter mode (EM0-EM3)
• Externally clocked quadrature decoder mode (EM0-EM3)
• Interrupt on counter underflow and overflow
• Interrupt when a direction change is detected (quadrature decoder mode only)
• Optional pulse width filter
• Optional input inversion/edge detect select
An overview of the PCNT module is shown in Figure 22.1 (p. 308) .
0 1 2 3
4
Quadrature code
Reload value
Interrupt
0
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307
What?
The Pulse Counter (PCNT) decodes
incoming pulses. The module has a
quadrature mode which may be used
to decode the speed and direction of a
mechanical shaft. PCNT can operate in EM0-
EM3.
Why?
The PCNT generates an interrupt after a
specific number of pulses (or rotations),
eliminating the need for timing- or I/O
interrupts and CPU processing to measure
pulse widths, etc.
How?
PCNT uses the LFACLK or may be externally
clocked from a pin. The module incorporates
an 8-bit up/down-counter to keep track of
incoming pulses or rotations.
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