ST72321R7-Auto datasheet(50/243 Pages) STMICROELECTRONICS

No. de pieza	ST72321R7-Auto

Descripción Electrónicos	PLL for 2x frequency multiplication

PDF	243 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

Logo

50 / 243 page

Interrupts

ST72321xx-Auto

50/243

Doc ID 13829 Rev 1

Figure 17.

Interrupt processing flowchart

Servicing pending interrupts

As several interrupts can be pending at the same time, the interrupt to be taken into account

is determined by the following two-step process:

●

the highest software priority interrupt is serviced,

●

if several interrupts have the same software priority then the interrupt with the highest

hardware priority is serviced first.

Figure 18 describes this decision process.

Figure 18.

Priority decision process flowchart

Table 15.

Interrupt software priority levels

Interrupt software priority

Level

Level 0 (main)

Low

High

Level 1

Level 2

Level 3 (= interrupt disable)

“IRET”

RESTORE PC, X, A, CC

STACK PC, X, A, CC

LOAD I1:0 FROM INTERRUPT SW REG.

FETCH NEXT

RESET

TRAP

PENDING

INSTRUCTION

I1:0

FROM STACK

LOAD PC FROM INTERRUPT VECTOR

Interrupt has the same or a

lower software priority

THE INTERRUPT

STAYS PENDING

than current one

EXECUTE

INSTRUCTION

INTERRUPT

PENDING

SOFTWARE

Different

INTERRUPTS

Same

HIGHEST HARDWARE

PRIORITY SERVICED

PRIORITY

HIGHEST SOFTWARE

PRIORITY SERVICED

ST72321R7-Auto Datasheet(PDF) 50 Page - STMicroelectronics

ST72321R7-Auto Datasheet(HTML) 50 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Descarga

Enlace URL