Uart Register Definitions, Scratch Register SCR

Parallel Host Interface 16C450/16C550A UART

9.2UART Register Definitions

9.2.1Scratch Register (SCR)

Figure 14. Scratch Register (SCR)

SCR

This is an 8-bit read/write register used by the DTE for temporary storage of data.

9.2.2Modem Status Register (MSR)

Figure 15. Modem Status Register (MSR)

DCD

DSR

CTS

DDCDD

TERI

DDSR

DCTS

This register provides four bits (bits 7:4) that show current modem state and four bits (bits 3:0) that provide modem change information. Bits 3:0 are set to ‘1’ whenever the control information changes state. These bits are reset to ‘0’ whenever the DTE reads the MSR register. If the modem status interrupt is enabled (IER3), the modem generates an interrupt on the ∝P HINT pin whenever MSR bits 3:0 are set to ‘1.’

	Bit 7	Data Carrier Detect (DCD)—When this bit is set to ‘1’, it indicates that the remote modem data carrier has been detected
	Bit 7	(refer to the &C command).
		(refer to the &C command).

	Bit 6	Ring Indicate (RI)—This bit indicates when a ring signal has been detected.

		Data Set Ready (DSR)—This bit indicates when the modem is ready to establish a communication link.
	Bit 5	When entering voice mode, DSR is set to 1. DSR is used for voice playback/record DMA mode to indicate when the DTE
	Bit 5	has not responded to a modem DMA data transfer request. DSR is set to 1 when DMA data are being transferred; DSR is
		set to 0 when a new DMA transfer has not occurred with 1.7 ms after the previous DMA transfer. DSR works similarly to a
		DMA terminal count.

	Bit 4	Clear To Send (CTS)—When this bit is set to ‘1’, it indicates to the DTE that the modem is ready to receive data.

	Bit 3	Delta Data Carrier Detect (DDCDD)—When this bit is set to ‘1’, it indicates that the DCD bit has changed its value since
	Bit 3	the DTE last read the MSR register.
		the DTE last read the MSR register.

	Bit 2	Trailing Edge of Ring Indicator (TERI)—This bit is set to ‘1’ after the RI signal goes from a high to low state.

	Bit 1	Delta Data Set Ready (DDSR)—When this bit is set to ‘1’, it indicates that the DSR bit has changed its value since the
	Bit 1	DTE last read the MSR register.
		DTE last read the MSR register.

	Bit 0	Delta Clear to Send (DCTS)—When this bit is set to ‘1’, it indicates that the CTS bit has changed its value since the DTE
	Bit 0	last read the MSR register.
		last read the MSR register.

536EX Chipset Developer’s Manual

Intel Confidential

537EX specifications

The Intel 537EX is a powerful and innovative embedded processor designed for a range of applications, particularly in the fields of industrial automation, telecommunications, and transport management systems. This processor is a member of Intel's embedded product line, tailored specifically to meet the demands of systems that require high reliability and long lifecycle support.

One of the main features of the Intel 537EX is its multi-core architecture, which enables efficient parallel processing capabilities. This allows for the execution of multiple tasks simultaneously, significantly improving overall system performance. The processor also incorporates Intel’s advanced power management technology, which ensures that the device consumes energy efficiently, enhances thermal performance, and prolongs the lifespan of the system.

The Intel 537EX supports a range of connectivity options, including high-speed Ethernet and Serial ATA interfaces. This ensures that it can easily integrate into existing systems, seamlessly supporting applications that require robust data transfer capabilities. Additionally, the processor is equipped with multiple I/O ports, facilitating the connection of various peripherals and sensors, which is crucial in industrial applications.

One of the standout technologies within the Intel 537EX is its support for hardware virtualization. This feature allows for the creation of multiple virtual environments within a single physical structure, optimizing resource utilization and enhancing system flexibility. Additionally, Intel’s integrated security technologies provide a significant layer of protection against potential threats, ensuring that embedded systems remain secure.

Another characteristic of the Intel 537EX is its extensive software support, which includes compatibility with various operating systems and development environments. This versatility makes it an attractive choice for developers looking to build or upgrade their embedded systems. With access to Intel's comprehensive software tools, developers can quickly optimize applications to take full advantage of the processor's capabilities.

The Intel 537EX also boasts excellent thermal performance, allowing it to operate efficiently in harsh environments. This is crucial for embedded applications in industrial settings where temperature fluctuations are common. Overall, the Intel 537EX is engineered to deliver high-performance processing power, superior connectivity, and enhanced security, solidifying its position as a reliable choice for demanding embedded applications.

Intel 537EX manual Uart Register Definitions, Scratch Register SCR, Modem Status Register MSR

Models: 537EX