TMPR4956C datasheet(149/286 Pages) TOSHIBA

Part #	TMPR4956C

Description	64-Bit TX System RISC TX49 Family

PDF	286 Pages

Scroll/Zoom	100%

Manufacturer	TOSHIBA [Toshiba Semiconductor]

Direct Link	http://www.semicon.toshiba.co.jp/eng

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149 / 286 page

Chapter 8 CPU Exception

8-21

Figure 8.20.2 General Exception Servicing Guidelines (SW)

Save the Context

Comments

* Treat in unmapped area

* Save the Context (Status, Cause, X/Context, EPC, etc.)

to stack area

* Avoid all other exceptions except to NMI, Soft Reset and

Cold Reset until saving the Context

* Check ExcCode field of Cause register

* Check the interrupt cause from IP field of Cause register

and IM field of Status register

* Negate the current interrupt cause in the service routine

* Set 1 to EXL field of Status register, and disable interrupt

on kernel mode

* Restore the saved registers

* Close the exception handler by ERET instruction

Check of interrupt

cause

Yes

Exception cause is

interrupt?

Interrupt disabled

ERET

Service routine of each

exception

Set Status register

(KSU

←00,

EXL

←0, IE = 1)

Restore Context

Interrupt enabled

Service routine of

each interrupts

TMPR4956C Datasheet(PDF) 149 Page - Toshiba Semiconductor