AS8228 datasheet(32/123 Pages) AMSCO

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Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 32 of 123

The following table shows the data which is available in the MDR:

Address

Reset Value

Description

samptoend[7:0]

9300h

FFh

samptoend[15:8]

9301h

FFh

Indicates how many samples are left (until nsamp), before the next

interrupt is generated. Using this information the MCU can

determine if it still has time to transfer the MDR data to the MCU

memory.

np[7:0]

9302h

00h

np[15:8]

9303h

00h

np[23:16]

9304h

00h

np[31:24]

9305h

00h

number of fast pulses, equivalent to energy information

accumulated during nsamp samples

sos_v[7:0]

9306h

00h

sos_v[15:8]

9307h

00h

sos_v[23:16]

9308h

00h

sos_v[31:24]

9309h

00h

sos_v[35:32]

930Ah

00h

sum of squares of voltage channel samples

sos_i1[7:0]

930Bh

00h

sos_i1[15:8]

930Ch

00h

sos_i1[23:16]

930Dh

00h

sos_i1[31:24]

930Eh

00h

sos_i1[39:32]

930Fh

00h

sos_i1[47:40]

9310h

00h

sos_i1[53:48]

9311h

00h

sum of squares of current channel 1 samples

sos_i2[7:0]

9312h

00h

sos_i2[15:8]

9313h

00h

sos_i2[23:16]

9314h

00h

sos_i2[31:24]

9315h

00h

sos_i2[39:32]

9316h

00h

sos_i2[47:40]

9317h

00h

sos_i2[53:48]

9318h

00h

sum of squares of current channel 2 samples

Notes:

1) MDR is read-only for MCU. (except for ‘MCU debug mode’, then you can set the register values as

described.)

2) Unused addresses will simply be ignored.

The following flowchart describes how accumulators and registers work together:

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