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Intel Embedded Microcontroller Programming and Verifying Modes, Rst Psen#, Prog#, Port Address

Models: Embedded Microcontroller 8XC251SP 8XC251SA 8XC251SQ 8XC251SB

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8XC251SA, SB, SP, SQ USER’S MANUAL

Table 14-1. Programming and Verifying Modes

Mode

RST

PSEN#

VPP

PROG#

Port

Port

Address

Notes

 

 

 

 

 

0

2

Port 1 (high)

 

 

 

 

 

 

 

 

Port 3 (low)

 

 

 

 

 

 

 

 

 

 

Program Mode. On-chip

High

Low

5 V,

5 Pulses

68H

data

 

1, 4

Code Memory

 

 

12.75 V

 

 

 

 

 

8K 87C251SA,SP

 

 

 

 

 

 

0000H-1FFFH

 

16K 87C251SB,SQ

 

 

 

 

 

 

0000H-3FFFH

 

 

 

 

 

 

 

 

 

 

Verify Mode. On-chip

High

Low

5 V

High

28H

data

 

4

Code Memory

 

 

 

 

 

 

 

 

8K 87/83C251SA,SP

 

 

 

 

 

 

0000H-1FFFH

 

16K 87/83C251SB,SQ

 

 

 

 

 

 

0000H-3FFFH

 

 

 

 

 

 

 

 

 

 

Program Mode. Configu-

High

Low

5 V,

5 Pulses

69H

data

FFF8H-FFFFH

1, 4

ration Bytes (UCONFIG0,

 

 

12.75 V

 

 

 

 

 

UCONFIG1)

 

 

 

 

 

 

 

 

87C251Sx

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Verify Mode. Configuration

High

Low

5 V

High

29H

data

FFF8H-FFFFH

4

Bytes (UCONFIG0,

 

 

 

 

 

 

 

 

UCONFIG1)

 

 

 

 

 

 

 

 

8XC251Sx

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Program Mode. Lock Bits

High

Low

5 V,

25 Pulses

6BH

data

0001H-0003H

1, 2

87C251Sx

 

 

12.75 V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Verify Mode. Lock bits

High

Low

5 V

High

2BH

data

0000H

3

87C251Sx, 83C251Sx

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Program Mode. Encryption

High

Low

5 V,

25 Pulses

6CH

data

0000H-007FH

1

Array

 

 

12.75 V

 

 

 

 

 

87C251Sx

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Verify Mode. Signature

High

Low

5 V

High

29H

data

0030H, 0031H,

 

Bytes

 

 

 

 

 

 

0060H,

 

87C251Sx, 83C251Sx

 

 

 

 

 

 

0061H

 

 

 

 

 

 

 

 

 

 

NOTES:

1.To program, raise VPP to 12.75 V and pulse the PROG# pin. See Figure 14-2 for waveforms.

2.No data input. Identify the lock bits with the address lines as follows: LB3 - 0003H, LB2 - 0002H, LB1 - 0001H.

3.The three lock bits are verified in a single operation. The states of the lock bits appear simultaneously at port 2 as follows: LB3 - P2.3, LB2 - P2.2. LB1 - P2.1. High = programmed.

4.For these modes, the internal address is FF:xxxxH.

14-4

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Intel Embedded Microcontroller, 8XC251SA, 8XC251SP, 8XC251SQ Programming and Verifying Modes, Rst Psen#, Prog#, Port Address
Page 243 Page 245

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.