mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 232
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)
Data Sheet
232
OUTF[1:0] — Calibration Mode CALOUT Pin Output Selection
RTCWE[1:0] — RTC Module Write Enable
OUTF[1:0]
These two bits select the output option for the CALOUT pin.
When CAL = 0, OUTF[1:0] is always 00.
These two write-only bits control the write-protect function of several
RTC registers and bits. After a reset, write-protect is disabled,
allowing full write access to RTC registers and bits. These two bits
always read as 0.
To enable write-protect, perform the following sequence:
To disable write-protect, perform the following sequence:
To disable write-protect from an unsure protection state, first perform
the enable write-protect sequence, followed by the disable write-
protect sequence.
1. Write %10 to RTCWE[1:0] bits
2. Write %10 to RTCWE[1:0] bits
1. Write %00 to RTCWE[1:0] bits
2. Write %01 to RTCWE[1:0] bits
3. Write %11 to RTCWE[1:0] bits
4. Write %10 to RTCWE[1:0] bits
00
01
10
11
Real Time Clock (RTC)
CALOUT pin is disconnected.
CALOUT pin outputs compensated 1-Hz.
CALOUT pin outputs CGMXCLK clock.
Reserved
Table 12-4. CALOUT Pin Output Option
CALOUT Pin Output
MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor
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