ST92141 STMicroelectronics, ST92141 Datasheet - Page 107

• Manufacturer Part Number: ST92141
• Description: 8/16-bit Mcu For 3-phase Ac Motor Control
• Manufacturer: STMicroelectronics

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
; INTERRUPT ROUTINE EXAMPLE
L6:
L2:
L3:
L4:
L5:
L7:
iret
push R234
spp #28
cp R254,#0
jxz L7
tm R254,#128
jxz L2
ld r1,R241
; Insert your code here
tm R254,#16
jxz L3
ld r1,R243
; Insert your code here
tm R254,#64
jxz L4
ld r1,R249
; Insert your code here
tm R254,#8
jxz L5
ld r1,R251
; Insert your code here
tm R254,#32
jxz L6
ld r1,R245
; Insert your code here
jx L6
pop R234
; Check Input Capture 2 flag
; Check Input Compare 1 flag
; Check Input Compare 2 flag
; Save current page
; Set EFT page
; while E0_SR is not cleared
; Check Input Capture 1 flag
; else go to next test
; Dummy read to clear IC1LR
; else go to next test
; Dummy read to clear IC2LR
; else go to next test
; Dummy read to clear OC1LR
; else go to next test
; Dummy read to clear OC1LR
; Check Input Overflow flag
; else go to next test
; Dummy read to clear Overflow flag
; Restore current page
ST92141 - EXTENDED FUNCTION TIMER (EFT)
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.
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