TMP93CS32F datasheet(28/180 Pages) TOSHIBA

28 / 180 page

TMP93CS32

2004-02-10

93CS32-26

Resetting initializes the CPU mask registers <IFF2:0> to 7; therefore, maskable

interrupts are disabled.

The following (1) to (5) show a flowchart of interrupt processing.

(1) Maskable

(2) Non-maskable interrupt

(3) Interrupt nesting

(4) Software interrupt

(5) Interrupt sampling timing

During execution of the main program, the CPU

accepts an interrupt request. The CPU increments the

IFF so that the interrupts of level 1 are not accepted

during processing the interrupt routine.

(Main)

[4]

[2]

[3]

RETI

[1]

SWI3

[5]

The CPU accepts the software interrupt request

during DI status(IFF

= 7) because of the level 7. The

IFF is not changed by the software interrupts.

(SWI3 routine)

Example:

(Underline): Instruction

[1], [2] …: Execution flow

RETI

(Main)

EI 3

[7]

[6]

RETI

[1]

INTT0

(Level 3)

[8]

If an interrupt with a level higher than the interrupt being

processed is generated, the CPU accepts the interrupt with the

higher level. The program counter which returns at e is the start

address of INTT0 interrupt routine.

(INTT0 interrupt routine)

XXX

INTT1

(Level 4)

[2]

[4]

RETI

[3]

[5]

(Main)

EI 3

[8]

[2]

[7]

RETI

[1]

INTT0

(Level 3)

[9]

During processing the interrupts of level 3, the IFF is set to 4.

When an interrupt with a level higher than level 4 is generated,

the CPU accepts the interrupt with the higher level, causing

interrupt processing to nest.

(INTT0 interrupt routine) (INTT1 interrupt routine)

IFF

← 4

IFF

← 3

[3]

INTT1

(Level 4)

[6]

[4]

[5]

IFF

← 5

IFF

← 4

(Main)

EI 1

[4]

[2]

[3]

RETI

[1]

INTT0

(Level 1)

[5]

(INTT0 interrupt routine)

IFF

← 2

IFF

← 1

(Main)

[4]

[2]

[3]

RETI

[1]

NMI

(Level 7)

[5]

DI instruction is executed in the main program, so that

the interrupts of only level 7 are accepted. The CPU

does not increment the IFF even if the CPU accepts

an interrupt request of level 7.

(NMI interrupt routine)

IFF

← 7

IFF

← 7

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