CHAPTER 5 TIME-BASE TIMER

5.7Program Example for Time-base Timer

Programming examples for the time-base timer are shown below.

■Programming Examples for Time-base Timer

●Processing specification

Repeatedly generate an interval timer interrupt at intervals of 218/FCH (FCH: oscillation frequency). The time interval is approximately 21.0 ms (operating at 12.5 MHz).

●Coding examples

TBTC

EQU

0000AH

;

Address of time-base timer control register

TBOF

EQU

TBTC:7

;

Definition of interrupt request flag bit

ILR2

EQU

007CH

;

Address of interrupt level setting register 2

INT_V

DSEG

ABS

;

[DATA SEGMENT]

 

ORG

0FFECH

 

 

IRQ7

DW

WARI

;

Setting interrupt vector

INT_V

ENDS

 

 

 

;------------------------

Main program---------------------------------------------------------------------------------

 

 

CSEG

 

;

[CODE SEGMENT]

 

 

 

; Stack pointer (SP) or other registers are assumed to

 

 

 

 

have been initialized.

 

:

 

 

 

 

CLRI

 

;

Interrupt disable

 

MOV

ILR2,#01111111B

;

Setting interrupt level (level 1)

 

MOV

TBTC,#01000100B

;

Clearing interrupt request flag, enabling interrupt

 

 

 

 

request output, selecting 218 /FCH, and clearing

 

 

 

 

time-base timer

 

SETI

 

;

Interrupt enable

 

:

 

 

 

;------------------------

Interrupt processing routine------------------------------------------------------------------

WARI

CLRB

TBOF

;

Clearing interrupt request flag

 

PUSHW A

 

 

 

XCHW

A,T

 

 

 

PUSHW A

 

 

 

:

 

 

 

 

User processing:

 

 

 

:

 

 

 

 

POPW

A

 

 

 

XCHW

A, T

 

 

125

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Fujitsu F202RA, MB89202 manual Program Example for Time-base Timer, Coding examples
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F202RA, MB89202 specifications

The Fujitsu MB89202 and F202RA microcontrollers are part of the 16-bit microcontroller family, renowned for their robust performance and versatility in a variety of embedded system applications. These devices are tailored for high-efficiency operation across diverse industries, including automotive, consumer electronics, and industrial automation.

One of the main features of the MB89202 is its powerful CPU core, which operates at a clock speed of up to 20 MHz. This enables the microcontroller to perform complex calculations and consumer-grade applications seamlessly. The architecture is designed to handle multiple tasks effectively, making it suitable for real-time operations.

Memory capacity is a vital characteristic of the MB89202, featuring on-chip RAM and ROM configurations. The microcontroller can accommodate different memory variants, providing developers with flexibility in memory allocation based on their application requirements. This adaptability facilitates applications ranging from simple control systems to complex data processing tasks.

The F202RA variant extends the capabilities of the MB89202 by integrating advanced peripheral functions. It includes built-in timers, A/D converters, and serial communication interfaces, which are essential for interfacing with other hardware components or sensors. The availability of these peripherals reduces the need for additional external circuits, thus contributing to a more compact and cost-effective design.

In terms of power management, the MB89202 series employs advanced power-saving technologies. The microcontroller offers various low-power modes, enabling devices to conserve energy during idle times, making it highly suitable for battery-operated applications. This characteristic not only enhances the efficiency of devices but also extends their operational lifespan.

Moreover, the Fujitsu MB89202 series incorporates robust protection features, including watchdog timers and failure detection mechanisms. These safety features ensure reliable operation in critical systems, making them a preferred choice in applications where failure is not an option.

The MB89202 and F202RA microcontrollers also support a range of development tools and environments, including integrated development environments (IDEs) and software libraries, which facilitate rapid application development. With these tools, developers can efficiently prototype, debug, and optimize their applications.

In summary, the Fujitsu MB89202 and F202RA microcontrollers stand out with their efficient performance, extensive memory options, integrated peripherals, and power-saving capabilities, making them ideal for a wide array of embedded applications. Their reliability and robustness further enhance their attractiveness for designers seeking advanced microcontroller solutions.
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