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PSD4235G2 датащи(PDF) 42 Page - STMicroelectronics

номер детали PSD4235G2
подробное описание детали  Flash In-System Programmable ISP Peripherals For 16-bit MCUs 5V Supply
PDF  89 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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PSD4235G2 датащи(HTML) 42 Page - STMicroelectronics

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Data Byte Enable Reference. MCUs have differ-
ent data byte orientations. Table 35 to Table 38
show how the PSD4235G2 interprets byte/word
operations in different bus write configurations.
Even-byte refers to locations with address A0
equal to 0, and odd byte as locations with A0 equal
to 1.
Table 35. 16-Bit Data Bus with BHE
MCU Bus Interface Examples. Figure 21 to Fig-
ure 26 show examples of the basic connections
between the PSD4235G2 and some popular
MCUs. The PSD4235G2 Control input pins are la-
beled as to the MCU function for which they are
configured. The MCU bus interface is specified us-
ing PSDsoft Express. The Voltage Stand-by (VST-
BY, PE6) line should be held at Ground if not in
use.
Table 36. 16-Bit Data Bus with WRH and WRL
Table 37. 16-Bit Data Bus with SIZ0, A0
(Motorola MCU)
Table 38. 16-Bit Data Bus with LDS, UDS
(Motorola MCU)
BHE
A0
D15-D8
D7-D0
0
0
Odd Byte
Even Byte
0
1
Odd Byte
—
1
0
—
Even Byte
WRH
WRL
D15-D8
D7-D0
0
0
Odd Byte
Even Byte
0
1
Odd Byte
—
1
0
—
Even Byte
SIZ0
A0
D15-D8
D7-D0
0
0
Even Byte
Odd Byte
1
0
Even Byte
—
1
1
—
Odd Byte
WRH
WRL
D15-D8
D7-D0
0
0
Even Byte
Odd Byte
1
0
Even Byte
—
0
1
—
Odd Byte



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