INITIALIZATION AND PROGRAMMING EXAMPLES
M68HC16 Z SERIES
E-26
USER’S MANUAL
* has overflowed ten times.
*
****************************************************************************
INCLUDE 'EQUATES.ASM' ;table of EQUates for common register
;addresses
INCLUDE 'ORG00000.ASM' ;initialize reset vector
INCLUDE 'ORG00008.ASM' ;initialize interrupt vectors
* We are choosing User Defined Interrupt Vector 9 (interrupt vector 64
* at address $0080) to be the base vector number (VBA) for the GPT
* because the least significant nibble in the address must be a $0.
*
* The VBA should be reflected in the GPT Interrupt Configuration
* Register (ICR) at $YFF904.
ORG $0080 ;Address for interrupt vector 64
DC.W PAOV_ROUTINE ;Adjusted Priority Channel -- PAC
DC.W IC1_ROUTINE ;Input Capture 1
DC.W IC2_ROUTINE ;Input Capture 2
DC.W IC3_ROUTINE ;Input Capture 3
DC.W BDM ;Output Compare 1
DC.W OC2_ROUTINE ;Output Compare 2
DC.W BDM ;Output Compare 3
DC.W BDM ;Output Compare 4
DC.W BDM ;Input Capture 4 / Output Compare 5
DC.W BDM ;Timer Overflow
DC.W BDM ;Pulse Accumulator Overflow -- elevated
DC.W BDM ;Pulse Accumulator Input
ORG $0200 ;start program after interrupt vectors
***** Initialization Routines *****
INCLUDE 'INITSYS.ASM' ;initially set EK=F, XK=0, YK=0, ZK=0
;set sys clock at 16.78 MHz, disable
COP
INCLUDE 'INITRAM.ASM' ;turn on 1k internal SRAM at $10000
;set stack in bank 1 (SK=1, SP=03FE)
INCLUDE 'INITSCI.ASM' ;set SCI baud rate at 9600
;enable SCI transmitter and receiver
* Set up the interrupts
LDD #$008E ;Give the GPT an IARB of $E
STD GPTMCR ;so we can generate interrupts
LDD #$A640 ;elevate interrupt priority of PAOV,
STD ICR ;set GPT IRQ level to 6,
;& assign vector 64 (User vector 9) of the
;interrupt/exception vector table as the
;GPT's Interrupt Vector Base Address
LDAB #$17 ;set OC2, IC1, IC2, IC3 to generate interrupts
STAB TMSK1
LDAB #$25 ;set PAC Overflows to generate interrupts
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Freescale Semiconductor, Inc.
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