8XC251SA, SB, SP, SQ USER’S MANUAL

PUSH <dest>

Function:

Push onto stack

Description: Increments the stack pointer by one. The contents of the specified variable are then copied into the on-chip RAM location addressed by the stack pointer.

Flags:

CY

AC

OV

N

Z

 

 

 

 

 

—

—

—

—

—

 

 

 

 

 

Example: On entering an interrupt routine, the stack pointer contains 09H and the data pointer contains 0123H. After executing the instruction sequence

PUSH DPL

PUSH DPH

the stack pointer contains 0BH and on-chip RAM locations 0AH and 0BH contain 01H and 23H, respectively.

Variations

PUSH dir8

Binary Mode Source Mode

Bytes:

 

2

2

States:

 

4

4

[Encoding]

 

 

 

1 1 0 0

 

0 0 0 0

 

 

 

 

Hex Code in: Binary Mode = [Encoding] Source Mode = [Encoding]

direct addr

Operation:

PUSH

 

 

(SP) ← (SP) + 1

 

 

((SP)) ← (dir8)

 

 

 

 

PUSH #data

 

 

 

Binary Mode

Source Mode

Bytes:

4

3

States:

4

3

[Encoding]

1 1 0 0

1 0 1 0

0 0 0 0

0 0 1 0

#data

Hex Code in: Binary Mode = [Encoding] Source Mode = [Encoding]

Operation: PUSH

(SP) ← (SP) + 1 ((SP)) ← #data

A-112

Page 363 Page 365
Page 364
Image 364
Intel Embedded Microcontroller, 8XC251SA Push dest Function, Push DPL Push DPH, Push #data Binary Mode, Operation Push
Page 363 Page 365

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.
Top Page Image Contents