MC68HC68 MOTOROLA [Motorola, Inc], MC68HC68 Datasheet - Page 9

• Manufacturer Part Number: MC68HC68
• Description: Real-Time Clock plus RAM with Serial Interface
• Manufacturer: MOTOROLA [Motorola, Inc]

MOTOROLA
NOTE:
$00 T0 $1F
$B0
N/A
N/A
N/A
X = Don’t Care for Write
X = 0 for Read
N/A = Not Applicable
READ
$20
$21
$22
$23
$24
$25
$26
$31
$32
HEX ADDRESS
$80 T0 $9F
WRITE
$A0
$A1
$A2
$A3
$A4
$A5
$A6
$B1
$B2
$AA
$A8
$A9
N/A
DB7
D7
HR
12
24
X
7
7
X
7
TENS 0 – 5
TENS 0 – 5
TENS 0 – 5
TENS 0 – 5
TENS 0 – 3
TENS 0 – 1
TENS 0 – 9
D6
X
X
6
6
X
6
Figure 6. Clock/RAM Registers
READ/WRITE REGISTERS
WRITE–ONLY REGISTERS
TENS 0 – 2
TENS 0 – 2
D5
X
READ–ONLY REGISTER
5
5
5
PM/AM
PM/AM
RAM DATA BYTE
D4
X
4
4
4
D3
X
3
3
3
UNITS 0 – 9
UNITS 0 – 9
UNITS 0 – 9
UNITS 0 – 9
UNITS 0 – 9
UNITS 0 – 9
UNITS 1 – 7
UNITS 0 – 9
UNITS 0 – 9
UNITS 0 – 9
D2
2
2
2
D1
1
1
1
D0
0
0
0
DB0
INTERRUPT CONTROL REGISTER
SECONDS (00 – 59)
MINUTES (00 – 59)
DB7, 1 = 12 HR, 0 = 24 HR
DB5, 1 = PM, 0 = AM
HOURS (01 – 12 OR 00 – 23)
DAY OF WEEK (01 – 07)
SUNDAY = 1
DATE OF MONTH (01 – 31)
MONTH (01 – 12)
JAN = 1
YEAR (00 – 99)
CLOCK CONTROL REGISTER
SECONDS ALARM (00 – 59)
MINUTES ALARM (00 – 59)
HOURS ALARM (01 – 21 OR 00 – 23)
DB5, 1 = PM, 0 = AM IN 12 HR MODE
STATUS REGISTER
DATA
FUNCTION
MC68HC68T1
9