CY8C26443 Datasheet, PDF (112/150 Pages) Cypress Semiconductor – Configurable Mixed-Signal Array with On-board Controller

Cypress MicroSystems CY8C25122/CY8C26233/CY8C26443/CY8C26643 Family Data Sheet
Table 89: Accumulator Result 3 / Multiply/Accumulator Clear 0 Register
Bit #
POR
Read/Write
Bit Name
7
0
RW
Data [7]
6
0
RW
Data [6]
5
0
RW
Data [5]
4
0
RW
Data [4]
3
0
RW
Data [3]
2
0
RW
Data [2]
1
0
RW
Data [1]
0
0
RW
Data [0]
Bit [7:0]: Data [7:0]
8-bit data value when read is the highest order result of the multiply/accumulate function
Any 8-bit data value when written will cause all four Accumulator result registers to clear
Accumulator Result 3 / Multiply/Accumulator Clear 0 Register (ACC_DR3 / MAC_CL0, Address = Bank 0, EEh)
Table 90: Accumulator Result 2 / Multiply/Accumulator Clear 1 Register
Bit #
POR
Read/Write
Bit Name
7
0
RW
Data [7]
6
0
RW
Data [6]
5
0
RW
Data [5]
4
0
RW
Data [4]
3
0
RW
Data [3]
2
0
RW
Data [2]
1
0
RW
Data [1]
0
0
RW
Data [0]
Bit [7:0]: Data [7:0]
8-bit data value when read is next to highest order result of the multiply/accumulate function
Any 8-bit data value when written will cause all four Accumulator result registers to clear
Accumulator Result 2 / Multiply/Accumulator Clear 1 Register (ACC_DR2 / MAC_CL1, Address = Bank 0, EFh)
11.2 Decimator
The output of a ∆−Σ modulator is a high-speed, single bit
A/D converter. A single bit A/D converter is of little use to
anyone and must be converted to a lower speed multiple
bit output. Converting this high-speed single bit data
stream to a lower speed multiple bit data stream requires
a data decimator.
A “divide by n” decimator is a digital filter that takes the
single bit data at a fast rate and outputs multiple bits at
one n^th the speed. For a single stage ∆−Σ converter, the
optimal filter has a sinc² response. This filter can be
implemented as a finite impulse response (FIR) filter and
for a “divide by n” implementation should have the follow-
ing coefficients:
Coeff
n
0
0
t
n-1
2n-1
Figure 30: Decimator Coefficients
112
Document #: 38-12010 CY Rev. *B CMS Rev. 3.22
August 18, 2003