Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  16   INTERRUPT  FUNCTIONS 

 

 

The interrupt function switches the program execution to other processing.  When the branch processing is finished, the 

program returns to the interrupted processing. 

The number of interrupt sources differs, depending on the product. 

 

 

25-pin 32-pin 48-pin 64-pin 

External 

5 6 10 

13 

Maskable 

interrupts 

Internal 

24 27 27 27 

 

 

The following two types of interrupt functions are used.  

 

These interrupts undergo mask control.  Maskable interrupts can be divided into four priority groups by setting the 

priority specification flag registers (PR00L, PR00H, PR01L, PR01H, PR02L, PR02H, PR10L, PR10H, PR11L, PR11H, 

PR12L, PR12H).  

Multiple interrupt servicing can be applied to low-priority interrupts when high-priority interrupts are generated.  If two 

or more interrupt requests, each having the same priority, are simultaneously generated, then they are processed 

according to the default priority of vectored interrupt servicing.  Default priority, see Table 16-1. 

A standby release signal is generated and STOP, HALT, and SNOOZE modes are released.  

External interrupt requests and internal interrupt requests are provided as maskable interrupts.  

 

This is a vectored interrupt generated by executing the BRK instruction.  It is acknowledged even when interrupts are 

disabled.  The software interrupt does not undergo interrupt priority control.   

 

 

Interrupt sources include maskable interrupts and software interrupts.  In addition, they also have up to seven reset 

sources (see Table 16-1).  The vector codes that store the program start address when branching due to the generation of 

a reset or various interrupt requests are two bytes each, so interrupts jump to a 64 K address of 00000H to 0FFFFH. 

 

R01UH0305EJ0200  Rev.2.00 

 

 

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Jul 04, 2013