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Intel 8XC251SQ manual ORL CY,/bit Binary Mode Source Mode Bytes States, POP src Function, Pop Sp

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

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8XC251SA, SB, SP, SQ USER’S MANUAL

ORL CY,/bit

Binary Mode Source Mode

Bytes:

4

 

 

3

 

 

 

States:

3†

 

 

2†

 

 

 

†If this instruction addresses a port (Px, x = 0–3), add 1 state.

[Encoding]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 0 1 0

1 0 0 1

 

1 1 1 0

 

0

y y y

 

 

 

 

 

 

 

 

 

direct addr

Hex Code in:

Binary Mode = [A5][Encoding]

 

 

 

 

 

Source Mode = [Encoding]

 

 

 

 

Operation:

ORL

 

 

 

 

 

 

(CY) ← (CY) V ¬ (bit)

 

 

 

 

 

 

 

 

 

 

 

 

 

POP <src>

 

 

 

 

 

 

 

Function:

Pop from stack

 

 

 

 

 

Description:

Reads the contents of the on-chip RAM location addressed by the stack pointer, then

 

decrements the stack pointer by one. The value read at the original RAM location is

 

transferred to the newly addressed location, which can be 8-bit or 16-bit.

Flags:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CY

 

AC

OV

N

Z

 

 

 

 

 

 

 

 

 

 

—

 

—

—

—

—

 

Example:

 

 

 

 

 

 

The stack pointer contains 32H and on-chip RAM locations 30H through 32H contain 01H,

 

23H, and 20H, respectively. After executing the instruction sequence

 

POP DPH

 

 

 

 

 

 

POP DPL

 

 

 

 

 

 

the stack pointer contains 30H and the data pointer contains 0123H. After executing the

 

instruction

 

 

 

 

 

 

POP SP

 

 

 

 

 

 

the stack pointer contains 20H. Note that in this special case the stack pointer was

Variations

decremented to 2FH before it was loaded with the value popped (20H).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

POP dir8

 

 

 

 

 

 

 

 

Binary Mode

Source Mode

 

 

 

Bytes:

2

 

2

 

 

 

 

States:

3

 

3

 

 

 

 

[Encoding]

1 1 0 1

0 0 0 0

direct addr

A-110

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Image 362
Intel 8XC251SQ, 8XC251SA manual ORL CY,/bit Binary Mode Source Mode Bytes States, POP src Function, Pop Dph Pop Dpl, Pop Sp
Page 361 Page 363

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.