MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 209

• Manufacturer Part Number: MC68HC908LJ12CPB
• Description: 8-bit microcontroller units
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Real Time Clock (RTC)
12.2 Introduction
12.3 Features
Technical Data
210
Addr.
$0042
$0043
RTC Control Register 1
RTC Control Register 2
Register Name
(RTCCR1)
(RTCCR2)
This section describes the real time clock (RTC) module. The RTC
provides real time clock and calendar functions with automatic leap year
adjustments. Other functions include alarm interrupt, periodic interrupts,
and a chronograph timer.
Features of the RTC module include:
Reset:
Reset:
Read:
Read:
Write:
Write:
Figure 12-1. RTC I/O Register Summary
•
•
•
•
•
Counter registers for:
– Second
– Minute
– Hour
– Day
– Day-of-week
– Month
– Year
Day counter with automatic month and leap year adjustment
1/100 seconds chronograph counter
Seven periodic interrupts
Alarm interrupt
ALMIE
Bit 7
R
0
0
0
Real Time Clock (RTC)
CHRCLR
= Unimplemented
CHRIE
6
0
0
0
DAYIE
CHRE
5
0
0
RTCE
HRIE
4
0
0
MINIE
R
3
0
0
0
MC68HC908LJ12
= Reserved
SECIE
XTL2
Freescale Semiconductor
0
0
2
TB1IE
XTL1
1
0
0
—
Rev. 2.1
TB2IE
XTL0
Bit 0
0
0