EFM32G200F64 Energy Micro, EFM32G200F64 Datasheet - Page 107

• 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

4.3.11.2 Bus Fault Status Register
2011-02-04 - d0002_Rev1.00
The flags in the BFSR indicate the cause of a bus access fault. The bit assignments are:
Table 4.27. BFSR bit assignments
Bits
[7]
[6:5]
[4]
[3]
[2]
[1]
IMPRECISERR
PRECISERR
BFARVALID
UNSTKERR
Reserved
IBUSERR
Name
BFARVALID
-
STKERR
UNSTKERR
IMPRECISERR
PRECISERR
STKERR
7 6 5 4 3 2 1 0
Function
Bus Fault Address Register (BFAR) valid flag:
0 = value in BFAR is not a valid fault address
1 = BFAR holds a valid fault address.
The processor sets this bit to 1 after a bus fault where the address is known. Other faults can
set this bit to 0, such as a memory management fault occurring later.
If a bus fault occurs and is escalated to a hard fault because of priority, the hard fault handler
must set this bit to 0. This prevents problems if returning to a stacked active bus fault handler
whose BFAR value has been overwritten.
Reserved.
Bus fault on stacking for exception entry:
0 = no stacking fault
1 = stacking for an exception entry has caused one or more bus faults.
When the processor sets this bit to 1, the SP is still adjusted but the values in the context area
on the stack might be incorrect. The processor does not write a fault address to the BFAR.
Bus fault on unstacking for a return from exception:
0 = no unstacking fault
1 = unstack for an exception return has caused one or more bus faults.
This fault is chained to the handler. This means that when the processor sets this bit to 1,
the original return stack is still present. The processor does not adjust the SP from the failing
return, does not performed a new save, and does not write a fault address to the BFAR.
Imprecise data bus error:
0 = no imprecise data bus error
1 = a data bus error has occurred, but the return address in the stack frame is not related to the
instruction that caused the error.
When the processor sets this bit to 1, it does not write a fault address to the BFAR.
This is an asynchronous fault. Therefore, if it is detected when the priority of the current
process is higher than the bus fault priority, the bus fault becomes pending and becomes active
only when the processor returns from all higher priority processes. If a precise fault occurs
before the processor enters the handler for the imprecise bus fault, the handler detects both
IMPRECISERR set to 1 and one of the precise fault status bits set to 1.
Precise data bus error:
0 = no precise data bus error
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