7220 datasheet(185/303 Pages) RENESAS

185 / 303 page

APPLICATION

5.1 Example of multi-line display

7220 Group User’s Manual

5-12

(4)

VSYNC interrupt processing routine when setting multiple interrupts

Figure 5.1.11 shows the flowchart of VSYNC interrupt processing routine when setting multiple interrupts.

A’ and B’ are the setting routines for multiple interrupts.

Fig. 5.1.11 Flowchart of VSYNC interrupt processing routine (when setting multiple interrupts)

VSYNC interrupt processing routine

RETURN

VSYNC interrupt processing

ICON1

ICON2

←ICON1

←ICON2

←“000000012”

←“000000002”

←“0”

V_ICON1

V_ICON2

ICON1 (address 00FE 16)

ICON2 (address 00FF 16)

Push registers X, Y, A

ICON1, ICON2:

V_ICON1, V_ICON2 :

A :

X :

Y :

T :

D :

Interrupt control registers 1, 2

Back up RAM for interrupt control

registers 1, 2 during V SYNC interrupt

Accumulator

Index register X

Index register Y

X modified operation mode flag

Decimal operation mode flag

←Disable all interrupts

←“1”

←V_ICON1

←V_ICON2

←Pop ICON 1 and 2 contents

during VSYNC interrupt

←“0”

A’

Set routine for

multiple

interrupts

Pop the registers X, Y, A

Disable

multiple interrupts

←Enable Timer 1 interrupt to

take priority than V SYNC interrupt.

And also, be sure to disable the following interrupts:

-VSYNC interrupt

-all interrupts with lower priority than V SYNC

interrupt.

B’

Enable state of

multiple interrupts

(Timer 1)

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