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71M6534 Datasheet(PDF) 54 Page - Maxim Integrated Products

Part No. 71M6534
Description  Exceeds IEC 62053/ANSI C12.20 Standards
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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71M6534 Datasheet(HTML) 54 Page - Maxim Integrated Products

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71M6533/G/H and 71M6534/H Data Sheet
FDS_6533_6534_004
54
Rev 2
If enabled with the IEN_WD_NROVF bit in I/O RAM, an interrupt occurs roughly 1 ms before the WDT resets
the chip. This can be used to determine the cause of a WDT reset since it allows the code to log its state
(e.g. the current PC value, loop counters, flags, etc.) before a WDT reset occurs.
1.5.13 Test Ports (TMUXOUT Pin)
One of the digital or analog signals listed in Table 49 can be selected to be output on the TMUXOUT pin.
The function of the multiplexer is controlled with TMUX[4:0] (I/O RAM 0x20AA[4:0]), as shown in Table 49.
The TMUXOUT pin may be used for diagnosis purposes or in production test. The RTC 1-second output
may be used to calibrate the crystal oscillator. The RTC 4-second output provides even higher precision.
Table 49: TMUX[4:0] Selections
TMUX[4:0]
Mode
Function
0
Analog
GNDD
1
Analog
Reserved
2
Analog
GNDD
3
Analog
Reserved
4
Analog
PLL_2P5
5
Analog
Output of the 2.5 V low-power regulator
6
Analog
Internal VBIAS voltage (nominally 1.6V)
7
Analog
Not used
8 - 0x0F
Reserved
0x10
Digital
RTC 1-second output
0x11
Digital
RTC 4-second output
0x12
Not used
0x13
Digital
V1 comparator output, synchronized to RTCLK
0x14
Digital
Real-time output from the CE
0x15
Digital
WDTR_EN (comparator 1 output AND V1LT3)
0x16
Digital
V2 comparator output (71M6534 only)
0x17
Digital
V1 comparator output, unsynchronized
0x18
Digital
RXD (from Optical interface, w/ optional inversion)
0x19
Digital
MUX_SYNC
0x1A
Not used
0x1B
Digital
CKMPU (MPU clock)
0x1C
Digital
Pulse output
0X1D
Digital
RTCLK (output of the oscillator circuit, nominally 32,786Hz)
0X1E
Digital
CE_BUSY (busy interrupt generated by CE, 396µs)
0X1F
Digital
XFER_BUSY (transfer busy interrupt generated by the CE,
nominally every 999.7ms)
1.5.14 V2 Comparator (71M6534/6534H Only)
The 71M6534/6534H offers a pin that is connected to an internal comparator. The voltage applied to this
pin is compared to the internal reference voltage (VBIAS). If the voltage at the V2 pin is above VBIAS,
the comparator output will be high (1). The comparator output is reflected at the TMUXOUT pin, when
0x16 is selected for TMUX[4:0].


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