NUC130LE3CN Nuvoton Technology Corporation of America, NUC130LE3CN Datasheet - Page 383

• Manufacturer Part Number: NUC130LE3CN
• Description: IC MCU 32BIT 128KB FLASH 48LQFP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro™ NUC100r

Specifications of NUC130LE3CN

• Core Processor: ARM Cortex-M0
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: CAN, I²C, IrDA, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 35
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 8x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

NuMicro™ NUC130/NUC140 Technical Reference Manual
bit time (i.e. the reciprocal of the bit rate) can be configured individually for each CAN node,
creating a common bit rate even though the oscillator periods of the CAN nodes (fosc) may be
different.
The frequencies of these oscillators are not absolutely stable, small variations are caused by
changes in temperature or voltage and by deteriorating components. As long as the variations
remain inside a specific oscillator tolerance range (df), the CAN nodes are able to compensate for
the different bit rates by re-synchronizing to the bit stream.
According to the CAN specification, the bit time is divided into four segments (see Figure 5-83).
The Synchronization Segment,the Propagation Time Segment, the Phase Buffer Segment 1 and
the Phase Buffer Segment 2. Each segment consists of a specific, programmable number of time
quanta (see Table 5-15). The length of the time quantum (tq), which is the basic time unit of the
bit time, is defined by the CAN controller’s APB clock fAPB and the BRP bit of the Bit Timing
Register (CAN_BTR): tq = BRP / fAPB.
The Synchronization Segment, Sync_Seg, is that part of the bit time where edges of the CAN bus
level are expected to occur. The distance between an edge that occurs outside of Sync_Seg, and
the Sync_Seg is called the phase error of that edge. The Propagation Time Segment, Prop_Seg,
is intended to compensate for the physical delay times within the CAN network. The Phase Buffer
Segments Phase_Seg1 and Phase_Seg2 surround the Sample Point. The (Re-)Synchronization
Jump Width (SJW) defines how far a re-synchronization may move the Sample Point inside the
limits defined by the Phase Buffer Segments to compensate for edge phase errors.
Nominal CAN Bit Time
Sync_ Seg
Prop_Seg
Phase_Seg1
Phase_Seg2
1 Time Quantum(tq )
Sample Point
Figure 5-83 Bit Timing
Publication Release Date: June 14, 2011
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Revision V2.01