Intel 8XC251SB, 8xC251TB, 8XC251SA, 8XC251SP, 8XC251SQ Bit Number, IPH1.0 IPL1.0 Priority Level

Page 17

8xC251Tx Hardware Description

3.2.6IE1

Address: B1H

Reset Value: xxxx xxx0B

 

 

Table 8. IE1 Special Function Register Definitions

 

 

 

 

Bit Number

Bit Mne-

 

Function

monic

 

 

 

 

 

 

 

 

7 - 1

-

 

Reserved

 

 

 

 

0

ES1

 

Second serial I/O port Interrupt Enable:

 

 

 

Setting this bit enables the second serial I/O port interrupt

 

 

 

 

3.2.7IPH1

Address: B3H

Reset Value: xxxx xxx0B

 

Table 9. IPH1 Special Function Register Definitions

 

 

 

Bit Number

Bit Mne-

Function

monic

 

 

 

 

 

7 - 1

-

Reserved

 

 

 

0

IPH1.0

Second serial I/O port Interrupt Priority High Bit

 

 

 

3.2.8IPL1

Address: B2H

Reset Value: xxxx xxx0B

 

Table 10. IPL1 Special Function Register Definitions

 

 

 

Bit Number

Bit Mne-

Function

monic

 

 

 

 

 

7 - 1

-

Reserved

 

 

 

0

IPL1.0

Second serial I/O port Interrupt Priority Low Bit

 

 

 

Interrupt priority of the second serial I/O port can be programmed to one of four levels depending on the IPH1.0 and IPL1.0 bits.

Table 11. Interrupt Priority of Second Serial I/O Port

IPH1.0

IPL1.0

 

Priority Level

 

 

 

 

0

0

0

(Lowest Priority)

 

 

 

 

0

1

1

 

 

 

 

 

1

0

2

 

 

 

 

 

1

1

3

(Highest Priority)

 

 

 

 

11

Image 17
Contents 8xC251TB, 8xC251TQ, Hardware Description Page Description DateDecember 273138-002 8xC251TB, 8xC251TQ Hardware Description 8xC251Tx Hardware Description OTPROM/EPROM XC251Tx Block DiagramPower & Ground Name XC251Tx Signal SummaryAddress & Data Name Processor Control NameAddress Line 16. See RD# XC251Tx Signal Descriptions Sheet 1Signal Type Description Alternate Name Function Timer 10 External Clock Inputs. When Timer 10 operates as a XC251Tx Signal Descriptions Sheet 2Signal XC251Tx Signal Descriptions Sheet 3Description Alternate Name Function GNDCH00000 CCAP0Hx CCAP1Hx CCAP2Hx CCAP3Hx CCAP4Hx Xxxxxxx Special Function Register SFR MapFunction Type Description Multiplexed Second Serial I/O Port SignalsMnemonic Description Address Second Serial I/O Port Special Function RegistersBit Number Function Mnemonic Bit Number Bit Mne Function Monic IPH1.0 IPL1.0 Priority Level Bit NumberInterrupt Mode UCONFIG1 bit definitions for the 8xC251TxReserved for Internal or Future Use Extended Data Float TimingsWSB#10 Wait State Extended Data Float Summary of the EDF# and WSB#10 Configuration Options
Related manuals
Manual 458 pages 25.38 Kb

8XC251SP, 8XC251SA, 8XC251SQ, 8xC251TB, 8xC251TQ specifications

The Intel 8XC251 series of embedded microcontrollers is a family of versatile and powerful devices, designed to meet the demands of a wide range of applications. With models such as the 8XC251SB, 8XC251SQ, 8XC251SA, and 8XC251SP, this series offers unique features while maintaining a high level of performance and reliability.

At the heart of the 8XC251 microcontrollers is the 8051 architecture, which provides a 16-bit processor capable of executing complex instructions efficiently. This architecture not only allows for a rich instruction set but also facilitates programming in assembly language and higher-level languages like C, which are essential for developing sophisticated embedded systems.

One of the significant features of the 8XC251 family is its integrated peripherals, including timer/counters, serial communication interfaces, and interrupt systems. These peripherals enable developers to implement timing functions, data communication, and real-time processing, all of which are crucial in modern embedded applications. The 8XC251SB and 8XC251SQ models, for instance, come equipped with multiple I/O ports that allow for interfacing with other devices and systems, enhancing their functionality in various environments.

The memory architecture of the 8XC251 devices is noteworthy, featuring on-chip ROM, RAM, and EEPROM. The on-chip memory allows for fast access times, which is essential for executing programs efficiently. Moreover, the EEPROM serves as non-volatile memory, enabling the storage of configuration settings and important data that must be retained even when power is lost.

In terms of operating voltage, the 8XC251 devices are designed to operate in a wide range, typically between 4.0V and 6.0V. This flexibility makes them suitable for battery-powered applications, where energy efficiency is critical. The power management features, including reduced power modes, further enhance their suitability for portable devices.

Lastly, the 8XC251 series is supported by a wide range of development tools and resources, allowing engineers and developers to streamline the development process. This support, combined with the microcontrollers' robust features, makes the Intel 8XC251 family a reliable choice for various embedded applications, such as industrial automation, automotive systems, and consumer electronics.

Overall, the Intel 8XC251SB, 8XC251SQ, 8XC251SA, and 8XC251SP deliver high performance, versatility, and ease of use, making them a preferred choice for embedded system designers looking to develop efficient and effective solutions.