EM78P468N/EM78P468L

8-Bit Microcontroller

6.1.4R3/SR (Status Register)

(Address: 03h)

Bit

7

Bit 6

 

Bit 5

Bit 4

Bit 3

Bit 2

 

Bit 1

Bit 0

 

 

−

 

PS1

PS0

T

P

Z

DC

C

 

 

 

 

 

 

 

 

 

 

 

Bit 7: Not used

Bits 6 ~ 5 (PS1 ~ 0): Page select bits

PS1

PS0

 

ROM Page (Address)

0

0

 

Page 0 (000H ~ 3FFH)

 

 

 

 

0

1

 

Page 1 (400H ~ 7FFH)

 

 

 

 

1

0

 

Page 2 (800H ~ BFFH)

 

 

 

 

1

1

 

Page 3 (C00H ~ FFFH)

 

 

 

 

PS0~PS1 are used to select a ROM page. User can use the PAGE instruction (e.g. PAGE 1) or set PS1~PS0 bits to change the ROM page. When executing a "JMP", "CALL", or other instructions which causes the program counter to be changed (e.g. MOV R2, A), PS0~PS1 are loaded into the 11th and 12th bits of the program counter where it selects one of the available program memory pages. Note that RET (RETL, RETI) instruction does not change the PS0~PS1 bits. That is, the return will always be to the page from where the subroutine was called, regardless of the current setting of PS0~PS1 bits.

Bit 4 (T): Time-out bit. Set to 1 by the "SLEP" and "WDTC" commands or during power up and reset to 0 by WDT timeout.

EventT

PRemark

WDT wake up from sleep mode

0

0

 

 

 

 

 

WDT time out (not sleep mode)

0

1

 

 

 

 

 

/RESET wake up from sleep

1

0

 

 

 

 

 

Power up

1

1

 

 

 

 

 

Low pulse on /RESET

1

1

⋅: don't care

 

 

 

 

Bit 3 (P): Power down bit. Set to 1 during power on or by a "WDTC" command and reset to 0 by a "SLEP" command.

Bit 2 (Z): Zero flag

Bit 1 (DC): Auxiliary carry flag

Bit 0 (C): Carry flag

8 •

Product Specification (V1.5) 02.15.2007

(This specification is subject to change without further notice)

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IBM MiEM78P468L manual 4 R3/SR Status Register, Bits 6 ~ 5 PS1 ~ 0 Page select bits, Bit 2 Z Zero flag, Bit 0 C Carry flag
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MiEM78P468L, MiEM78P468N specifications

The IBM MiEM78P468N and MiEM78P468L are advanced integrated circuit solutions that cater primarily to the needs of enterprise-level computing systems. These microprocessors are integral in handling a variety of complex tasks, thereby empowering businesses with the efficiency and speed required in today's fast-paced digital environment.

Both models utilize the cutting-edge 78P architecture, which provides impressive performance capabilities. The MiEM78P468N operates at a clock speed of up to 2.2 GHz, while the MiEM78P468L offers a lower clock speed optimized for energy efficiency. This distinction makes the N version ideal for high-performance applications, whereas the L version appeals to scenarios where power consumption is a critical consideration.

A key characteristic of both models is their multi-core architecture, supporting up to four cores. This feature allows for enhanced parallel processing, enabling the handling of multiple tasks simultaneously—a vital requirement for data-intensive applications. Moreover, the inclusion of advanced cache memory arrangements enhances data retrieval speeds significantly, ensuring that applications run smoothly without performance bottlenecks.

These processors also employ cutting-edge thermal management technologies. The dynamic voltage and frequency scaling (DVFS) capabilities ensure that performance can be adjusted in real-time based on workload requirements, helping to minimize energy consumption. This is particularly beneficial in maintaining optimal operating temperatures and prolonging the lifespan of the hardware.

Another notable feature is support for advanced security protocols. Both models incorporate hardware-based security technologies that safeguard data integrity and protect against unauthorized access. This is becoming increasingly important in today's cybersecurity landscape where businesses must prioritize protecting sensitive information.

Additionally, the IBM MiEM78P468N and MiEM78P468L processors are compatible with a wide range of operating systems, facilitating seamless integration into various IT environments. Their robust architecture supports extensive peripheral interconnect protocols, enhancing expandability and connectivity options.

In summary, the IBM MiEM78P468N and MiEM78P468L processors stand out for their performance capabilities, energy efficiency, advanced security features, and versatility. They are well-suited for organizations looking to enhance their computing power while maintaining a balance between performance and power consumption. These microprocessors are instrumental in driving innovation and efficiency in enterprise computing.
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