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71M6545/71M6545H Data Sheet
4 ? RTC_P + RTC_Q = floor ?
? 1 + ? ? 10
+ 0 . 5 ?
? 32768 ? 8
? 6
?
?
Conversely, the amount of ppm shift for a given value of 4RTC_P + RTC_Q is:
32768 ? 8
? ( ppm ) = ?
? 1 ? ? 10 6
?
?
?
? 4 ? RTC P + RTC Q
?
?
For example, for a shift of -988 ppm, 4 ? RTC_P + RTC_Q = 262403 = 0x40103. RTC_P[16:0] = 0x10040,
( I/O RAM 0x289B[2:0], 0x289C, 0x289D[7:2] ) and RTC_Q[1:0] = 0x03 ( I/O RAM 0x289D[1:0] . The default
values of RTC_P[16:0] and RTC_Q[1:0] , corresponding to zero adjustment, are 0x10000 and 0x0, respectively.
Two settings for the TMUX2OUT test pin, PULSE_1S and PULSE_4S, are available for measuring and
calibrating the RTC clock frequency. These are waveforms of approximately 25% duty cycle with 1s or 4s
period.
Default values for RTCA_ADJ[6:0] , RTC_P[16:0] and RTC_Q[1:0] should be nominal values, at
the center of the adjustment range. Uncalibrated extreme values (zero, for example) can cause
incorrect operation.
If the crystal temperature coefficient is known, the MPU can integrate temperature and correct the RTC
time as necessary. Alternatively, the characteristics can be loaded into an NV RAM and the OSC_COMP
( I/O RAM 0x28A0[5 ]) bit may be set. In this case, the oscillator is adjusted automatically, even in SLP
mode. See 2.5.4.4 RTC Temperature Compensation for details.
2.5.4.4 RTC Temperature Compensation
The 71M6545/H can be configured to regularly measure die temperature, including in SLP mode,
provided that the VBAT_RTC pin is supplied with a voltage within specification provided by a battery. If
enabled by OSC_COMP , this temperature information is automatically used to correct for the temperature
variation of the crystal. A table lookup method is used.
Table 41 shows I/O RAM registers involved in automatic RTC temperature compensation.
Table 41: I/O RAM Registers for RTC Temperature Compensation
Name
OSC_COMP
STEMP[10:3]
STEMP[2:0]
LKPADDR[6:0]
LKPAUTOI
LKPDAT[7:0]
LKP_RD
LKP_WR
Location
28A0[5]
2881[7:0]
2882[7:5]
2887[6:0]
2887[7]
2888[7:0]
2889[1]
2889[0]
Rst
0
–
0
0
0
0
0
Wk
0
–
0
0
0
0
0
Dir
R/W
R
R/W
R/W
R/W
R/W
R/W
Description
Enables the automatic update of RTC_P[16:0] and
RTC_Q[1:0] every time the temperature is measured.
The result of the temperature measurement (10-bits
of magnitude data plus a sign bit).
The address for reading and writing the RTC lookup
RAM.
Auto-increment flag. When set, LKPADDR[6:0] auto
increments every time LKP_RD or LKP_WR is pulsed.
The incremented address can be read at
LKPADDR[6:0] .
The data for reading and writing the RTC lookup
RAM.
Strobe bits for the RTC lookup RAM read and write.
When set, the LKPADDR[6:0] and LKPDAT registers
are used in a read or write operation. When a strobe is
set, it stays set until the operation completes, at which
time the strobe is cleared and LKPADDR[6:0] is
incremented if LKPAUTOI is set.
Referring to Figure 13 the table lookup method uses the 10-bits plus sign-bit value in STEMP[10:0]
right-shifted by two bits to obtain an 8-bit plus sign value (i.e., NV RAM Address = STEMP[10:0] /4). A
limiter ensures that the resulting look-up address is in the 6-bit plus sign range of -64 to +63 (decimal).
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