mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 244
mc68hc908lj24
Manufacturer Part Number
mc68hc908lj24
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908LJ24.pdf
(464 pages)
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Real Time Clock (RTC)
12.10.13 Day-Of-Week Register (DOWR)
12.10.14 Chronograph Data Register (CHRR)
Data Sheet
244
NOTE:
This register is write-protected; unprotect by a write sequence to RTCWE[1:0] in RTCCOMR.
Address:
Address:
This read/write register contains the current value of the day-of-week
counter. This register can be read at any time without affecting the
counter count. Writing to this register loads the value to the day-of-week
counter and the counter continues to count from this new value.
The day-of-week counter value rolls over to 0 ($00) after reaching 6
($06). Writing a value other than 0 to 6 to this register has no effect.
This read-only chronograph data register contains the value in the
chronograph counter. Reset clears the chronograph data register.
Setting the chronograph counter reset bit (CHRCLR) also clears the
chronograph data register.
The chronograph data register has a resolution of 1/100 seconds. The
chronograph counter value rolls over to $00 after reaching $63.
The chronograph counter is not synchronized to the compensated RTC
1-Hz clock. Hence, chronograph ticks may not align with the RTC clock
and calendar register updates.
Reset:
Reset:
Read:
Write:
Read:
Write:
$004D
$004E
Figure 12-20. Chronograph Data Register (CHRR)
0
0
0
0
Figure 12-19. Day-Of-Week Register (DOWR)
Real Time Clock (RTC)
= Unimplemented
= Unimplemented
CHR6
0
0
0
CHR5
0
0
0
CHR4
0
0
0
CHR3
MC68HC908LJ24/LK24 — Rev. 2.1
0
0
0
DOW2
CHR2
Freescale Semiconductor
U
0
DOW1
CHR1
U
0
DOW0
CHR0
U
0
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