NUC140LD2CN Nuvoton Technology Corporation of America, NUC140LD2CN Datasheet - Page 373

• Manufacturer Part Number: NUC140LD2CN
• Description: IC MCU 32BIT 64KB FLASH 48LQFP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro™ NUC100r

Specifications of NUC140LD2CN

• Core Processor: ARM Cortex-M0
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: CAN, I²C, IrDA, LIN, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 31
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 8K 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

5.13.5.2 Loop Back Mode
5.13.5.3 Loop Back Combined with Silent Mode
5.13.5.4 Basic Mode
The CAN Core can be set in Loop Back Mode by programming the Test Register bit LBack to
one. In Loop Back Mode, the CAN Core treats its own transmitted messages as received
messages and stores them into a Receive Buffer (if they pass acceptance filtering).Figure 5-78
shows the connection of signals, CAN_TX and CAN_RX , to the CAN Core in Loop Back Mode.
This mode is provided for self-test functions. To be independent from external stimulation, the
CAN Core ignores acknowledge errors (recessive bit sampled in the acknowledge slot of a data/
remote frame) in Loop Back Mode. In this mode, the CAN Core performs an internal feedback
from its Tx output to its Rx input. The actual value of the CAN_RX input pin is disregarded by the
CAN Core. The transmitted messages can be monitored on the CAN_TX pin.
It is also possible to combine Loop Back Mode and Silent Mode by programming bits LBack and
Silent to one at the same time. This mode can be used for a “Hot Selftest”, which means that
C_CAN can be tested without affecting a running CAN system connected to the CAN_TX and
CAN_RX pins. In this mode, the CAN_RX pin is disconnected from the CAN Core and the
CAN_TX pin is held recessive. Figure 5-80 shows the connection of signals CAN_TX and
CAN_RX to the CAN Core in case of the combination of Loop Back Mode with Silent Mode.
The CAN Core can be set in Basic Mode by programming the Test Register bit Basic to one. In
NuMicro™ NUC130/NUC140 Technical Reference Manual
Figure 5-80 CAN Core in Loop Back Mode Combined with Silent Mode
Figure 5-79 CAN Core in Loop Back Mode
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Publication Release Date: June 14, 2011
Revision V2.01