Code:
sec VAR BYTE ' seconds
mins VAR BYTE ' minutes
hr VAR BYTE ' hours
day VAR BYTE ' day
date VAR BYTE ' date
mon VAR BYTE ' month
yr VAR BYTE ' year
 'DEC VARS
SEC_O   VAR BYTE
SEC_T   VAR BYTE
MIN_O   VAR BYTE
MIN_T   VAR BYTE
HR_O    VAR BYTE
HR_T    VAR BYTE
MON_O   VAR BYTE
MON_T   VAR BYTE
DATE_O  VAR BYTE
DATE_T  VAR BYTE
YR_O    VAR BYTE
YR_T    VAR BYTE

    '#################################################
READ_RTC:
I2CREAD DS_SDA, DS_SCL, RTC, SecReg, [sec,mins,hr,day,date,mon,yr]

SEC_T = sec & $70
SEC_T = SEC_T>>4
SEC_O = sec & $0F

MIN_T = mins & $70
MIN_T = MIN_T>>4
MIN_O = MINs & $0F

HR_T = hr & $70
HR_T = HR_T>>4
HR_O = hr & $0F

MON_T = mon & $70
MON_T = MON_T>>4
MON_O = mon & $0F

DATE_T = date & $70
DATE_T = DATE_T>>4
DATE_O = date & $0F

YR_T = yr & $70
YR_T = YR_T>>4
YR_O = yr & $0F