8XC251SA, SB, SP, SQ USER’S MANUAL

 

Programming Cycle

Verification Cycle

P1, P3

Address (16-Bit)

 

Address

P2

Data In (8-Bit)

 

Data Out

PROG#

 

 

 

 

 

1

2

3

4

5

 

12.75V

 

 

 

 

 

EA#/VPP 5V

 

 

 

 

 

P0

 

Mode (8-Bit)

Mode

 

 

 

 

 

A4129-01

Figure 14-2. Program/Verify Bus Cycles

 

14.5 VERIFY ALGORITHM

Use this procedure to verify user program code, signature bytes, configuration bytes, and lock bits stored in nonvolatile memory on the 8XC251Sx. To preserve the secrecy of the encryption key byte sequence, the encryption array cannot be verified. Verification can be performed on bytes as they are programmed, or on a block of bytes that have been previously programmed. The proce- dure for verifying the 8XC251Sx is as follows:

1.Set up the controller for operation in the appropriate mode according to Table 14-1.

2.Input the 16-bit address on ports P1 and P3.

3.Wait for the data on port P2 to become valid (TAVQV = 48 clock cycles — see the datasheet), then compare the data with the expected value.

4.If the procedure is program/immediate-verify, return to step 8 of 14.4, “Programming Algorithm,” to program the next byte.

5.Repeat steps 1 through 5 until all memory locations are verified.

14.6 PROGRAMMABLE FUNCTIONS

This section discusses factors related to programming and verifying the various nonvolatile mem- ory functions.

14-6

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Intel 8XC251SP, 8XC251SA, 8XC251SQ, 8XC251SB manual Verify Algorithm, Programmable Functions, Programming Cycle
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Embedded Microcontroller, 8XC251SP, 8XC251SA, 8XC251SQ, 8XC251SB 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.
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