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SECTION 3
HARDWARE USER'S MANUAL
3-75
3.10 The Real Time Clock (RTC) 72423
There is an RTC 72423 installed on the CPU board, containing its own battery to maintain the RTC function
during power down.
3.10.1 Address Map of the RTC Registers
The RTC 72423 is a four bit device. It must be accessed in byte mode and the upper four bits are "don't
care" during read and write accesses. The base address of the RTC is $FF803000. The following table
shows the register layout of the RTC 72423.
Table 3-17: RTC Register Layout
Default I/O Base Address: $FF80 0000
Default Offset: $0000 3000
Default Name: RTC
Address
Offset
Label
Description
HEX
FF803000
00
RTC1SEC
1 Second Digit Register
FF803001
01
RTC10SEC
10 Second Digit Register
FF803002
02
RTC1MIN
1 Minute Digit Register
FF803003
03
RTC10MIN
10 Minute Digit Register
FF803004
04
RTC1HR
1 Hour Digit Register
FF803005
05
RTC10HR
PM/AM and 10 Hour Digit Register
FF803006
06
RTC1DAY
1 Day Digit Register
FF803007
07
RTC10DAY
10 Day Digit Register
FF803008
08
RTC1MON
1 Month Digit Register
FF803009
09
RTC10MON
10 Month Digit Register
FF80300A
0A
RTC1YR
1 Year Digit Register
FF80300B
0B
RTC10YR
10 Year Digit Register
FF80300C
0C
RTCWEEK
Week Register
FF80300D
0D
RTCCOND
Control Register D
FF80300E
0E
RTCCONE
Control Register E
FF80300F
0F
RTCCONF
Control Register F
3.10.2 RTC Programming
The following programming example shows how to read from or write to the RTC. Please note that the RTC
must be stopped prior to reading the date and time registers. For further details, please refer to the RTC
72423 Data Sheet in
Section 5, COPIES OF DATA SHEETS in this manual.
Содержание SYS68K/CPU-40
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