User guide

SmartBook for Renesas R8C/Tiny Microcontrollers

www.MightyMicons.com

Chapter 5. Interrupt Mechanism

5.1 Introduction:

Interrupt facilities of the target microcontrollers plays a vital role in the system

design. Professional designers may give a serious thought on these interrupt

features to find out the suitability of the controller to use in a range of complicated

applications. Lack of required interrupt power may even stall the project in the

mid way.

R8C/Tiny micons come with advanced and flexible interrupt facilities to make

even demanding designers feel motivated on using the controllers.

R8C/Tiny controllers have interrupt facilities for all the

peripheral functions, few special functions apart from

non-maskable software interrupts catering to few

instructions. Basically, these interrupts are

divided into hardware and software

interrupts. In the hardware group, all the

peripheral related interrupts are included.

The micon’s special chip functions like

watchdog timer, oscillation stop

detection, voltage detection, single

step executing facility and the

address matching function generate

interrupts when they are properly



 The

micon’s special

chip functions like

watchdog timer, oscillation

stop detection, voltage detection,

single step executing facility and the

address matching function generate

interrupts when they are properly initiated.



For your information,

maskable interrupts are

the kind which can be

activated or disabled by

configuring an Interrupt

enable flag (I flag).