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71M6534 Datasheet(PDF) 67 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) 67 Page - Maxim Integrated Products

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FDS_6533_6534_004
71M6533/G/H and 71M6534/H Data Sheet
Rev 2
67
2.7 CE/MPU Communication
Figure 30 shows the functional relationships between the CE and the MPU. The CE is controlled by the
MPU via shared registers in the I/O RAM and in RAM.
The CE outputs two interrupt signals to the MPU: CE_BUSY and XFER_BUSY, which are connected to
the MPU interrupt service inputs as external interrupts. CE_BUSY indicates that the CE is actively
processing data. This signal will occur once every multiplexer cycle. XFER_BUSY indicates that the CE
is updating data to the output region of the RAM. This will occur whenever the CE has finished generating a
sum by completing an accumulation interval determined by SUM_CYCLES[5:0] * PRE_SAMPS[1:0] samples.
Interrupts to the MPU occur on the falling edges of the XFER_BUSY and CE_BUSY signals.
Refer to Section 5.3 CE Interface Description for additional information on setting up the device using the
MPU firmware.
APULSEW
APULSER
EXT PULSE
SAG CONTROL
DATA
DIO
XFER BUSY
SAMPLES
CE
MPU
INTERRUPTS
I/O RAM (Configuration RAM)
Mux Control
ADC
DISPLAY (Memory
mapped LCD
segments)
SERIAL
(UART0/1)
EEPROM
(I2C)
VAR
(DIO7)
PULSES
W (DIO6)
CE BUSY
Figure 30: MPU/CE Communication


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