ST92P141K4D0 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST92P141K4D0

8/16-BIT MCU FOR 3-PHASE AC MOTOR CONTROL

STMicroelectronics 

ST92141 - 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

register between these instructions, but it can

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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