CAN SERIAL COMMUNICATIONS CONTROLLER

CAN_MSGxCON0 (Continued)

Address:

1Ex0H (x = 1–F)

x = 1–15 (87C196CB)

Reset State:

Unchanged

Program the CAN message object x control 0 (CAN_MSGxCON0) register to indicate whether the message object is ready to transmit and to control whether a successful transmission or reception generates an interrupt. The least-significant bit-pair indicates whether an interrupt is pending.

This register consists of four bit-pairs — the most-significant bit of each pair is in true form and the least-significant bit is in complement form. This format allows software to set or clear any bit with a single write operation, without affecting the remaining bits.

87C196CB

7

MSGVAL

MSGVAL

TXIE

TXIE

 

 

 

 

0

RXIE

RXIE

INT_PND

INT_PND

 

 

 

 

Bit

Bit

 

 

Function

Number

Mnemonic

 

 

 

 

 

 

 

 

3:2

RXIE

Receive Interrupt Enable

 

 

Transmit message objects do not use this bit-pair.

 

 

For a receive message object, set this bit-pair to enable this message

 

 

object to initiate a receive (RX) interrupt after a successful reception. You

 

 

must also set the interrupt enable bit (CAN_CON.1) to enable the interrupt.

 

 

bit 3

bit 2

 

 

 

0

1

no interrupt

 

 

1

0

generate an interrupt

 

 

 

1:0

INT_PND

Interrupt Pending

 

 

This bit-pair indicates that this message object has initiated a transmit (TX)

 

 

or receive (RX) interrupt. Software must clear this bit when it services the

 

 

interrupt.

 

 

 

bit 1

bit 0

 

 

 

0

1

no interrupt

 

 

1

0

an interrupt was generated

 

 

 

 

 

Figure 7-14. CAN Message Object x Control 0 (CAN_MSGxCON0) Register (Continued)

7-25

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Intel 87C196CB, 8XC196NT user manual Rxie, Intpnd

8XC196NT, 87C196CB specifications

The Intel 87C196CB and 8XC196NT are microcontrollers from the C196 family, which was designed to meet the demands of embedded control technology. These microcontrollers are popular in various applications due to their robust architecture, extensive I/O capabilities, and specialized functionality, making them ideal for automotive, industrial, and communication systems.

The 87C196CB is distinguished by its 16-bit architecture, offering a balance of processing power and efficiency. It features a 16-bit data bus, which allows for fast data processing, and a 16-bit address bus, supporting up to 64KB of program memory. The microcontroller integrates on-chip memory, including 2KB of ROM and 128 bytes of RAM, which facilitates faster execution of programs and data handling.

One of the standout features of the 87C196CB is its versatility in I/O operations. It comes equipped with 32 general-purpose I/O lines that can be configured for various functions, including input, output, and interrupt handling. This flexibility enables developers to optimize the microcontroller for their specific application needs.

The 8XC196NT builds on the capabilities of its predecessor, offering advanced functionalities such as an enhanced instruction set and integrated peripherals. It includes additional features like timers, serial communication interfaces, and analog-to-digital converters, which expand its usability in complex embedded systems. The 8XC196NT supports multiple addressing modes, allowing for more efficient programming and memory management.

Both microcontrollers utilize innovative technologies that improve performance and power efficiency. The on-chip operating system support aids in real-time processing and multitasking, making them suitable for time-sensitive applications. Power management features are also incorporated, allowing these microcontrollers to operate in low-power modes, which is crucial for battery-operated devices.

The 87C196CB and 8XC196NT microcontrollers are characterized by their reliability and long service life, meeting the stringent demands of industrial applications. Their ability to perform tasks rapidly, combined with their diverse peripheral support, makes them popular choices among engineers and developers designing embedded systems. Overall, the Intel 87C196CB and 8XC196NT microcontrollers remain relevant in the rapidly evolving landscape of embedded technology, facilitating innovative solutions across various industries.