Maxim Integrated Secure Microcontroller - Manual (Page 173)

Secure Microcontroller User’s Guide
173 of 187
MOV DPTR, #TEXT2
LCALL TEXT_OUT
MOV R0, #4
LCALL RBYTE ; Read the hour.
DEC R0
LCALL HEX_OUT ; Display the hour.
MOV A, #’:’
LCALL CHAR_OUT
LCALL RBYTE ; Read the minute.
LCALL HEX_OUT ; Display the minute.
MOV A, #’:’
LCALL CHAR_OUT
LCALL RBYTE ; Read the second.
LCALL HEX_OUT ; Display the second.
MOV A, #’.’
LCALL CHAR_OUT
LCALL RBYTE ; Read fraction of second.
LCALL HEX_OUT ; Display fraction of second.
MOV DPTR, #TEXT3
LCALL TEXT_OUT
MOV A, #80H
MOV R0, #11
LCALL WBYTE ; Unfreeze the registers.
;
SJMP CONTINUE ; Repeat indefinitely.
;
;Utilities
HEX_IN:
MOV B, #0
HEX_LP:
LCALL CHAR_IN
LCALL CHAR_OUT
CJNE A, #0DH, NOT_CR
MOV A, B
RET
NOT_CR:
ADD A, #–30H
JNC HEX_LP
CJNE A, #10, $+3
JC HEX_XX
ADD A, #–7
CJNE A, #10, $+3
JC HEX_LP
CJNE A, #16, $+3
JNC HEX_LP
HEX_XX:
XCH A, B
ANL A, #0FH
SWAP A
ORL A, B
MOV B, A
SJMP HEX_LP
;
HEX_OUT:
MOV B, #2
OUT_LP:
SWAP A
PUSH ACC
ANL A, #0FH
CJNE A, #10, $+3
JC HEX_OK