LFDAS12XSDT Freescale Semiconductor, LFDAS12XSDT Datasheet - Page 363

• Manufacturer Part Number: LFDAS12XSDT
• Description: HARDWARE MC9S12XS 52-PIN
• Manufacturer: Freescale Semiconductor

Specifications of LFDAS12XSDT

• Module/board Type: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: -

12.6
To get started quickly with the PIT24B8C module this section provides a small code example how to use
the block. Please note that the example provided is only one specific case out of the possible configurations
and implementations.
Functionality: Generate an PIT interrupt on channel 0 every 500 PIT clock cycles.
; ******************** Start PIT Initialization *******************************************************
;******************** Main Program *************************************************************
MAIN:
;******************** Channel 0 Interupt Routine ***************************************************
CH0_ISR:
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Application Information
ORG
LDS
MOVW
CLR
MOVB
CLR
MOVB
MOVW
MOVB
MOVB
CLI
BRA *
LDAA
MOVB
RTI
CODESTART
RAMEND
#CH0_ISR,VEC_PIT_CH0 ; Change value of channel 0 ISR adr
PITCFLMT
#$01,PITCE
PITMUX
#$63,PITMTLD0
#$0004,PITLD0
#$01,PITINTE
#$80,PITCFLMT
PITTF
#$01,PITTF
S12XS Family Reference Manual, Rev. 1.11
; place the program into specific
; range (to be selected)
; load stack pointer to top of RAM
; disable PIT
; enable timer channel 0
; ch0 connected to micro timer 0
; micro time base 0 equals 100 clock cycles
; time base 0 eq. 5 micro time bases 0 =5*100 = 500
; enable interupt channel 0
; enable PIT
; clear Interupt disable Mask bit
; loop until interrupt
; 8 bit read of PIT time out flags
; clear PIT channel 0 time out flag
; return to MAIN
Periodic Interrupt Timer (S12PIT24B4CV1)
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