EM78P468N/EM78P468L

8-Bit Microcontroller

6.3 TCC and WDT Prescaler

Two 8-bit counters are available as prescalers for the TCC (Time Clock Counter) and WDT (Watchdog Timer). The TCCP2~TCCP0 bits of the IOC71 register are used to determine the ratio of the TCC prescaler. Likewise, the WDTP2~WDTP0 bits of the IOC81 register are used to determine the WDT prescaler. The TCC prescaler (TCCP2~TCCP0) is cleared by the instructions each time they are written into TCC, while the WDT prescaler is cleared by the “WDTC” and “SLEP” instructions. Fig.7 depicts the circuit diagram of TCC and WDT.

R1 (TCC) is an 8-bit timer/counter. The clock source of TCC can be selected by internal instruction clock or external signal input (edge selectable from the TCC control register). If the TCC signal source is from the internal instruction clock, the TCC will be incremented by 1 at every instruction cycle (without prescaler). If the TCC signal source is from an external clock input, the TCC will be incremented by 1 at every falling edge or rising edge of the TCC pin.

The Watchdog Timer is a free running on sub-oscillator. The WDT will keep on running even after the oscillator driver has been turned off. During Normal mode, Green mode, or Idle mode operation, a WDT time-out (if enabled) will cause the device to reset. The WDT can be enabled or disabled at any time during the Normal mode and Green mode by software programming. Refer to WDTE bit of IOC81 register. The WDT time-out period is equal to (prescaler ⋅ 256 / (Fs/2)).

Instruction Clock = Fosc /2 Fosc: CPU operate frequency

TCC

Pin

TE (IOC71)

MUX

TS (IOC71)

Prescaler

PSRE TCCP2~0 (IOC71) (IOC71)

Data Bus

TCC (R1)

8 to 1 MUX

TCCoverflow interrupt

Fig. 6-4(a) Block Diagram of TCC

WDT

WDTE (IOC81)

8 bit counter

8 to 1 MUX

WDT Time out

Prescaler

WDTP2~0

(IOC81)

Fs/2

(Fs:Sub oscillator)

Fig. 6-4(b) Block Diagram of WDT

Product Specification (V1.5) 02.15.2007

• 23

(This specification is subject to change without further notice)

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IBM MiEM78P468N, MiEM78P468L manual TCC and WDT Prescaler, Mux
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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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