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71M6534 Datasheet(PDF) 53 Page - Maxim Integrated Products

Part No. 71M6534
Description  Exceeds IEC 62053/ANSI C12.20 Standards
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

71M6534 Datasheet(HTML) 53 Page - Maxim Integrated Products

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FDS_6533_6534_004
71M6533/G/H and 71M6534/H Data Sheet
Rev 2
53
V3P3
V3P3 -
400mV
V3P3 - 10mV
VBIAS
0V
Battery
modes
Normal
operation,
WDT
enabled
WDT dis-
abled
V1
A15 A14
A1
A0
C0
0
31
x
D7
D6
D1
D0
D7
D6
D1
D0
C5
C6
C7
x
PCSZ
PSCK
PSDI
PSDO
8 bit CMD
16 bit Address
DATA[ADDR]
DATA[ADDR+1]
7
8
23
24
32
39
Extended Read . . .
SERIAL READ
A15 A14
A1
A0
C0
0
31
C5
C6
C7
x
PCSZ
PSCK
PSDI
PSDO
8 bit CMD
16 bit Address
DATA[ADDR]
DATA[ADDR+1]
7
8
23
24
32
39
Extended Write . . .
SERIAL WRITE
D7
D6
D1
D0
D7
D6
D1
D0
x
HI Z
HI Z
(From Host)
(From 653X)
(From Host)
(From 653X)
Figure 16: SPI Slave Port: Typical Read and Write Operations
SFR locations, i.e. the control registers internal to the 71M653x MPU, are not accessible via the SPI port.
In cases where these registers have to be accessed, for example to control DIO pins, a protocol that uses
the MPU has to be used for read and write operations involving the SFRs.
1.5.12 Hardware Watchdog Timer
An independent, robust, fixed-duration, watchdog timer (WDT) is included in the 71M6533/71M6534. It
uses the RTC crystal oscillator as its time base and must be refreshed by the MPU firmware at least every
1.5 seconds. When not refreshed on time, the WDT overflows and the
part is reset as if the RESET pin were pulled high, except that the I/O
RAM bits will be in the same state as after a wake-up from SLEEP or LCD
modes (see the I/O RAM description in Section 5.2 for a list of I/O RAM bit
states after RESET and wake-up). 4100 oscillator cycles (or 125 ms) after
the WDT overflow, the MPU will be launched from program address
0x0000.
A status bit, WD_OVF, is set when the WDT overflow occurs. This bit is
preserved in LCD mode (not in SLEEP mode) and can be read by the
MPU when WAKE rises to determine if the part is initializing after a WDT
overflow event or after a power-up. After it is read, the MPU firmware
must clear WD_OVF. The WD_OVF bit is also cleared by the RESET pin.
There is no internal digital state that deactivates the WDT. The WDT can
be disabled by tying the V1 pin to V3P3 (see Figure 17). Of course, this
also deactivates V1 power fault detection. Since there is no method in
firmware to disable the crystal oscillator or the WDT, it is guaranteed that
whatever state the part might find itself in, upon watchdog overflow, the
part will be reset to a known state.
Figure 17: Functions Defined by V1
Asserting ICE_E will also deactivate the WDT. This is the only method that will work in BROWNOUT mode.
In normal operation, the WDT is reset by periodically writing a one to the WDT_RST bit. The watchdog timer
is also reset when the internal signal WAKE=0 (see Section 2.5 Wake Up Behavior).


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