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11. Note
11.1 The Use of INT Instruction
MR100 has INT instruction interrupt numbers reserved for issuing service calls as listed in Table 11.1 Interrupt Number
Assignment. For this reason, when using software interrupts in a user application, do not use interrupt numbers 63 through
48 and be sure to use some other numbers.
Table 11.1 Interrupt Number Assignment
Interrupt No. Service calls Used
249 Service calls that can be issued from only task context
250 Service calls that can be issued from only non-task context.
Service calls that can be issued from both task context and non-task context.
251 ret_int service call
252 dis_dsp service call
253 loc_cpu, iloc_cpu service call
254 ext_tsk service call
255 Reserved for future extension
11.2 The Use of registers of bank
The registers of bank is 0, when a task starts on MR100.
MR100 does not change the registers of bank in processing kernel.
You must pay attention to the followings.
• Don’t change the regisers of bank in processing a task.
• If an interrupt handler with regisers of bank 1 have multiple interrupts of an interrupt handler with regis-
ers of bank 1 , the program can not execute normally.