EFM32G200F64 Energy Micro, EFM32G200F64 Datasheet - Page 111

• 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

4.4 System timer, SysTick
4.4.1 SysTick Control and Status Register
2011-02-04 - d0002_Rev1.00
Software must follow this sequence because another higher priority exception might change the MMFAR
or BFAR value. For example, if a higher priority handler preempts the current fault handler, the other
fault might change the MMFAR or BFAR value.
The processor has a 24-bit system timer, SysTick, that counts down from the reload value to zero, reloads
(wraps to) the value in the LOAD register on the next clock edge, then counts down on subsequent
clocks.
Note
The system timer registers are:
Table 4.32. System timer registers summary
1
The SysTick CTRL register enables the SysTick features. See the register summary in Table 4.32 (p.
111) for its attributes. The bit assignments are:
Table 4.33. SysTick CTRL register bit assignments
31
SysTick calibration value.
Address
0xE000E010 CTRL
0xE000E014 LOAD
0xE000E018 VAL
0xE000E01C CALIB
Bits
[31:17]
[16]
[15:3]
[2]
[1]
Name
-
COUNTFLAG
-
CLKSOURCE
TICKINT
When the processor is halted for debugging the counter does not decrement.
Name
Reserved
Type
RW
RW
RW
RO
Function
Reserved.
Returns 1 if timer counted to 0 since last time this was read.
Reserved.
Indicates the clock source:
0 = Bit 0 of RTC counter value
1 = HFCORECLK
Enables SysTick exception request:
0 = counting down to zero does not assert the SysTick exception request
1 = counting down to zero to asserts the SysTick exception request.
Software can use COUNTFLAG to determine if SysTick has ever counted to zero.
Required
privilege
Privileged
Privileged
Privileged
Privileged
COUNTFLAG
Reset value Description
0x00000004 Section 4.4.1 (p. 111)
0x00000000 Section 4.4.2 (p. 112)
0x00000000 Section 4.4.3 (p. 112)
0x400036B0
17 16 15
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111
1
Section 4.4.4 (p. 113)
Reserved
CLKSOURCE
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ENABLE
TICKINT
3 2 1 0
0 0
0