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參數資料
型號: 71M6541G-IGTR/F
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 模擬信號調理
英文描述: SPECIALTY ANALOG CIRCUIT, PQFP64
封裝: LEAD FREE, LQFP-64
文件頁數: 117/165頁
文件大小: 2208K
代理商: 71M6541G-IGTR/F
v1.1
2008–2011 Teridian Semiconductor Corporation
55
0
22.00
0
22.65
1
22.33
2
22.65
3
22.98
4
23.31
1
23.96
5
23.64
6
23.96
7
24.29
252
104.40
63
105.06
253
104.73
254
105.06
255
105.39
For proper operation, the MPU must load the lookup table with values that reflect the crystal properties
with respect to temperature, which is typically done once during initialization. Since the lookup table is
not directly addressable, the MPU uses the following procedure to load the entire NV RAM table:
1.
Set the LKPAUTOI bit (I/O RAM 0x2887[7]) to enable address auto-increment.
2.
Write zero into the I/O RAM register LKPADDR[6:0] (I/O RAM 0x2887[6:0]).
3.
Write the 8-bit datum into I/O RAM register LKPDAT (I/O RAM 0x2888).
4.
Set the LKP_WR bit (I/O RAM 0x2889[0]) to write the 8-bit datum into NV_RAM
5.
Wait for LKP_WR to clear (LKP_WR auto-clears when the data has been copied to NV RAM).
6.
Repeat steps 3 through 5 until all data has been written to NV RAM.
The NV RAM table can also be read by writing a 1 into the LKP_RD bit (I/O RAM 0x2889[1]). The process of
reading from and writing to the NV RAM is accelerated by setting the LKPAUTOI bit (I/O RAM 0x2887[7]).
When LKPAUTOI is set, LKPADDR[6:0] auto-incremented every time LKP_RD or LKP_WR is pulsed. It is
also possible to perform random access of the NV RAM by writing a 0 to the LKPAUTOI bit and loading the
desired address into LKPADDR[6:0].
If the oscillator temperature compensation feature is not being used, it is possible to use the NV
RAM storage area as ordinary NV storage space using the procedure described above to read and
write NV RAM data. In this case, keep the OSC_COMP bit (I/O RAM 0x28A0[5]) reset to disable the
automatic oscillator temperature compensation feature.
2.5.4.5 RTC Interrupts
The RTC generates interrupts each second and each minute. These interrupts are called RTC_1SEC and
RTC_1MIN. In addition, the RTC functions as an alarm clock by generating an interrupt when the minutes
and hours registers both equal their respective target counts as defined in Table 45. The alarm clock
interrupt is called RTC_T. All three interrupts appear in the MPU’s external interrupt 6. See Table 33
in the interrupt section for the enable bits and flags for these interrupts.
The target registers for minutes and hours are listed in Table 45.
Table 45: I/O RAM Registers for RTC Interrupts
Name
Location Rst
Wk
Dir
Description
RTC_TMIN[5:0]
289E[5:0]
0
R/W The target minutes register. See RTC_THR[4:0] below.
RTC_THR[4:0]
289F[4:0]
0
R/W The target hours register. The RTC_T interrupt occurs
when RTC_MIN becomes equal to RTC_TMIN and
RTC_HR becomes equal to RTC_THR.
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