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71M6531D Datasheet(PDF) 61 Page - Teridian Semiconductor Corporation

Part No. 71M6531D
Description  Energy Meter IC
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Maker  TERIDIAN [Teridian Semiconductor Corporation]
Homepage  http://www.teridian.com
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71M6531D Datasheet(HTML) 61 Page - Teridian Semiconductor Corporation

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FDS 6531/6532 005
Data Sheet 71M6531D/F-71M6532D/F
v1.2
© 2005-2009 TERIDIAN Semiconductor Corporation
61
Figure 26: MPU/CE Data Flow
2.7
CE/MPU Communication
Figure 27 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 generat-
ing a sum by completing an accumulation interval determined by SUM_CYCLES * PRE_SAMPS samples.
Interrupts to the MPU occur on the falling edges of the XFER_BUSY and CE_BUSY signals.
Refer to Section 4.3 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
(I
2C)
VAR
(DIO7)
PULSES
W (DIO6)
CE BUSY
Figure 27: MPU/CE Communication
CE
MPU
Pre-
Processor
Post-
Processor
IRQ
Processed
Metering
Data
Pulses
I/O RAM (Configuration RAM)
Samples
Data


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