參數(shù)資料
型號: MC68HC705PD6
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 131/165頁
文件大小: 841K
代理商: MC68HC705PD6
GENERAL RELEASE SPECIFICATION
July 7, 1997
MOTOROLA
CLOCK DISTRIBUTION
MC68HC05PD6
8-8
REV 1.1
The hours and minutes registers are in fact holding registers (See Figure 8-3).
When setting the RTC time, the hours and minutes are written rst, then writing to
the seconds register will cause the hours and minutes in their holding registers to
be latched into the RTC hardware.
When reading the RTC time, the seconds register is rst accessed; this will cause
the hardware to latch the hours and minutes into their respective holding registers.
Now, reading the hours and minutes registers will give the time for the moment
when the seconds register was read.
Figure 8-3. RTC Holding Register
W
R
reset
0
7
00
54
0
0000
6
3210
0
HOUR4
0
HOUR3
HOUR2
HOUR0
HOUR1
HOUR
$0033
W
R
reset
0
7
00
54
0
0000
6
3210
0
MIN4
MIN5
MIN3
MIN2
MIN0
MIN1
MIN
$0034
W
R
reset
0
7
00
54
0
0000
6
3210
0
SEC4
SEC5
SEC3
SEC2
SEC0
SEC1
SEC
$0035
Hours
Minutes ($34)
Seconds ($35)
Hours ($33)
Minutes
CPU CORE
Holding registers
RTC Hardware registers
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