Renesas M3T-MR100 Instrukcja Użytkownika Pobierz pdf (Strona 263)

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[Precautions]

1. Regarding the method for specifying a register bank

No kernel interrupt handlers that use the registers in register bank 1 can be written in C language. These handlers can only

be written in assembly language. When writing in assembly language, write the entry and exit to and from the interrupt

handler as shown below.

(Always be sure to clear the B flag before issuing ret_int service call.)

Example: interrupt;

fset B

fclr B

ret_int

Internally in the MR100 kernel, register banks are not switched over.

2. Regarding the method for specifying a high-speed interrupt

To ensure the effective use of a high-speed interrupt, be sure that the registers in register bank 1 are used in the high-speed

interrupt. Also be aware that the high-speed interrupts used cannot be a kernel interrupt handler..

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