S912XHZ512F1VAG Datasheet, PDF (321/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256

XGATE_DATA_FLASH
XGATE_DATA_SCI
XGATE_DATA_IDX
XGATE_DATA_MSG
XGATE_CODE_FLASH
XGATE_CODE_DONE
XGATE_CODE_FLASH_END
XGATE_DUMMY_ISR_XG
Chapter 5 XGATE (S12XGATEV2)
;###########################################
;#
XGATE DATA
#
;###########################################
ALIGN 1
EQU *
EQU *-XGATE_DATA_FLASH
DW SCI_REGS
;pointer to SCI register space
EQU *-XGATE_DATA_FLASH
DB XGATE_DATA_MSG ;string pointer
EQU *-XGATE_DATA_FLASH
FCC "Hello World! ;ASCII string
DB $0D
;CR
;###########################################
;#
XGATE CODE
#
;###########################################
ALIGN 1
LDW R2,(R1,#XGATE_DATA_SCI);SCI -> R2
LDB R3,(R1,#XGATE_DATA_IDX);msg -> R3
LDB R4,(R1,R3+)
;curr. char -> R4
STB R3,(R1,#XGATE_DATA_IDX);R3 -> idx
LDB R0,(R2,#(SCISR1-SCI_REGS));initiate SCI transmit
STB R4,(R2,#(SCIDRL-SCI_REGS));initiate SCI transmit
CMPL R4,#$0D
BEQ XGATE_CODE_DONE
RTS
LDL R4,#$00
;disable SCI interrupts
STB R4,(R2,#(SCICR2-SCI_REGS))
LDL R3,#XGATE_DATA_MSG;reset R3
STB R3,(R1,#XGATE_DATA_IDX)
RTS
EQU (XGATE_CODE_FLASH_END-XGATE_CODE_FLASH)+XGATE_CODE_XG
MC9S12XHZ512 Data Sheet, Rev. 1.06
Freescale Semiconductor
321