ST92F124 datasheet(179/426 Pages) STMICROELECTRONICS

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EXTENDED FUNCTION TIMER (EFT)

EXTENDED FUNCTION TIMER (Cont’d)

Note: A single access (read/write) to the SR regis-

ter at the beginning of the interrupt routine is the

first step needed to clear all the EFT interrupt

flags. In a second step, the lower bytes of the data

registers must be accessed if the corresponding

flag is set. It is not necessary to access the SR

done.

; INTERRUPT ROUTINE EXAMPLE

push R234

; Save current page

spp #28

; Set EFT page

L6:

cp R254,#0

; while E0_SR is not cleared

jxz L7

tm R254,#128

; Check Input Capture 1 flag

jxz L2

; else go to next test

ld r1,R241

; Dummy read to clear IC1LR

; Insert your code here

L2:

tm R254,#16

; Check Input Capture 2 flag

jxz L3

; else go to next test

ld r1,R243

; Dummy read to clear IC2LR

; Insert your code here

L3:

tm R254,#64

; Check Input Compare 1 flag

jxz L4

; else go to next test

ld r1,R249

; Dummy read to clear OC1LR

; Insert your code here

L4:

tm R254,#8

; Check Input Compare 2 flag

jxz L5

; else go to next test

ld r1,R251

; Dummy read to clear OC1LR

; Insert your code here

L5:

tm R254,#32

; Check Input Overflow flag

jxz L6

; else go to next test

ld r1,R245

; Dummy read to clear Overflow flag

; Insert your code here

jx L6

L7:

pop R234

; Restore current page

iret

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