Page 368 - Introduction to Microcontrollers Architecture, Programming, and Interfacing of The Motorola 68HC12

PROBLEMS :H5

get: BRCLR SC1SR,$20,get
LDAB SC1DR
RTS

* void main() { char i;

PSHA

* SC1BD = 52; 7*9600 baud*/ SC1CR = OxC; /* enable Xmt, Rev devices */

MOVW #52,SC1BD
MOVE #$C,SC1CR

* i = SC1SR; i = SC1DR; i = SClSR; i = SC1DR; /* clear RDRF */

LDAB SClSR
LDAB SC1DR
LDAB SClSR
LDAB SC1DR

* for(i = 0; i < 9; i++) put(str[i]);

CLR 0,SP
LDX #str
11: LDAB B, X
BSR put
INC 0,SP
LDAB 0,SP
CMPB #9
BLT 11

* do j = get(); while( j != '\r') ;

12: BSR get
STAB j
CMPB #13
BNE 12
PULA
RTS

Figure 11.18. Program with Disassembly