NEC PD78058F(A) Manuale Utente

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CHAPTER 21 INTERRUPT AND TEST FUNCTIONS

Internal bus

Test input
signal

Standby
release signal

21.5 Test Functions

When a clock timer overflow occurs and when the port 4 falling edge is detected, a corresponding test input flag

is set (1) and a standby release signal is generated.

Unlike the interrupt function, vector processing is not executed.

There are two test input factors as shown in Table 21-5. The basic configuration is shown in Figure 21-18.

Table 21-5. Test Input Factors

Test Input Factors

Name

Trigger

INTWT

Watch timer overflow

Internal

INTPT4

Falling edge detection at port 4

External

Figure 21-18. Basic Configuration of Test Function

Remark

IF : test input flag

MK: test mask flag

21.5.1 Registers controlling the test function

The test function is controlled by the following three registers.

• Interrupt request flag register 1L (IF1L)

• Interrupt mask flag register 1L (MK1L)

• Key return mode register (KRM)

The names of the test input flags and test mask flags corresponding to the test input signals are listed in Table

21-6.

Table 21-6. Flags Corresponding to Test Input Signals

Test Input Signal Name

Test Input Flag

Test Mask Flag

INTWT

WTIF

WTMK

INTPT4

KRIF

KRMK

Internal/

External