mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 227

• Manufacturer Part Number: mc68hc908lj24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

12.8 RTC Register and Bit Write Protection
MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor
A write-protect mechanism is implemented to prevent accidental writes
to the RTC clock registers, calendar registers, and other control bits. The
protected RTC registers and bits are listed in
(CGMXCLK
UNCOMPENSATED
COMPENSATED
1-Hz CLOCK
1-Hz CLOCK
CGMXCLK
Table 12-3. Write-Protected RTC Registers and Bits
÷
32768)
RTC Control Register 1
RTC Control Register 2
Day-Of-Week Register
Real Time Clock (RTC)
Figure 12-4. 1-Hz Clock Compensation
Second Register
Minute Register
Month Register
Hour Register
Year Register
Day Register
Register
1-Hz CLOCK = CGMXCLK
PERIOD A
TRUE 15 SECONDS
÷
A
RTC Register and Bit Write Protection
1-Hz CLOCK = CGMXCLK
OUTF[1:0]
AUTOCAL
Table
PERIOD B
COMEN
(All Bits)
(All Bits)
(All Bits)
(All Bits)
(All Bits)
(All Bits)
(All Bits)
RTCE
CAL
Bit
Real Time Clock (RTC)
12-3.
÷
B
Data Sheet
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