MC68HC908LJ24 Datasheet, PDF (219/464 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Real Time Clock (RTC)
I/O Pins
12.4 I/O Pins
Two RTC clock calibration pins are shared with standard port I/O pins.
Table 12-1. Pin Name Conventions
RTC
Generic Pin Name
Full MCU Pin Name
Pin Selected for RTC Function by
Bits in RTCCOMR ($0040)
CALIN
CALOUT
PTD0/SS/CALIN
PTD3/SPSCK/CALOUT ⁽¹⁾
AUTOCAL
OUTF[1:0}
Notes:
1. Do not enable the SPI function if the pin is used for RTC calibration.
Addr.
Register Name
Bit 7
6
RTC Calibration Control ^{Read: 0}
0
$0040
Register Write: R
R
(RTCCOMR) _{Reset: 0}
0
RTC Calibration Data ^{Read: EOVL}
0
$0041
Register Write:
(RTCCDAT) _{Reset: U}
0
$0042
Read:
RTC Control Register 1
(RTCCR1)
Write:
Reset:
ALMIE
0
CHRIE
0
$0043
Read:
RTC Control Register 2
(RTCCR2)
Write:
Reset:
COMEN
U
0
CHRCLR
0
$0044
Read:
RTC Status Register
(RTCSR)
Write:
Reset:
ALMF
0
CHRF
0
Read: 0
0
$0045
Alarm Minute Register
(ALMR)
Write:
Reset: 0
0
†† Reset by POR only.
U = Unaffected
5
4
3
CAL AUTOCAL OUTF1
0
0
0
E5
E4
E3
U
U
U
DAYIE HRIE MINIE
0
0
0
CHRE
0
DAYF
RTCE
0^††
HRF
TBH
0
MINF
0
0
0
AM5
AM4
AM3
U
U
U
= Unimplemented
2
OUTF0
0
1
Bit 0
0
0
RTCWE1 RTCWE0
0
0
E2
E1
E0
U
U
U
SECIE TB1IE TB2IE
0
0
0
0
0
0
0
SECF
0
TB1F
0
TB2F
0
0
0
AM2
AM1
AM0
U
U
U
R = Reserved
Figure 12-1. RTC I/O Register Summary
MC68HC908LJ24/LK24 — Rev. 2
MOTOROLA
Real Time Clock (RTC)
For More Information On This Product,
Go to: www.freescale.com
Data Sheet
219