M68HC16 Z SERIES
INITIALIZATION AND PROGRAMMING EXAMPLES
USER’S MANUAL
E-11
DC.W BDM ;241 User Defined Interrupt Vector 186
DC.W BDM ;242 User Defined Interrupt Vector 187
DC.W BDM ;243 User Defined Interrupt Vector 188
DC.W BDM ;244 User Defined Interrupt Vector 189
DC.W BDM ;245 User Defined Interrupt Vector 190
DC.W BDM ;246 User Defined Interrupt Vector 191
DC.W BDM ;247 User Defined Interrupt Vector 192
DC.W BDM ;248 User Defined Interrupt Vector 193
DC.W BDM ;249 User Defined Interrupt Vector 194
DC.W BDM ;250 User Defined Interrupt Vector 195
DC.W BDM ;251 User Defined Interrupt Vector 196
DC.W BDM ;252 User Defined Interrupt Vector 197
DC.W BDM ;253 User Defined Interrupt Vector 198
DC.W BDM ;254 User Defined Interrupt Vector 199
DC.W BDM ;255 User Defined Interrupt Vector 200
E.1.4 INITSYS.ASM
* Title : INITSYS
* Description : Initialize & configure system including
* the Software Watchdog and System Clock.
****************************************************************************
INITSYS: ;give initial values for extension registers
;and initialize system clock and COP
LDAB #$0F
TBEK ; point EK to bank F for register access
LDAB #$00
TBXK ; point XK to bank 0
TBYK ; point YK to bank 0
TBZK ; point ZK to bank 0
LDD #$0003 ; at reset, the CSBOOT block size is 512k.
STD CSBARBT ; this line sets the block size to 64k
LDD #$3830; async, both byte, R/W, AS, Zero WS, S/U SP, IPL all,
;AVEC off
STD CSORBT ;
LDAA #$7F ; w=0, x=1, y=111111
STAA SYNCR ; set system clock to 16.78 Mhz
CLR SYPCR ; turn COP (software watchdog) off,
; since COP is on after reset
E.1.5 INITRAM.ASM
* Title : INITRAM
* Description : Initialize the HC16's 1K internal SRAM
* (put SRAM in memory map at $10000, bank 1)
* and set the stack inside it.
*****************************************************************************
INITRAM: ;initialize internal SRAM and stack
LDD #$0001
STD RAMBAH ; store high ram array, bank 1
LDD #$0000
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
.
..