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PSD934210MIT Arkusz danych(PDF) 39 Page - STMicroelectronics

Numer części PSD934210MIT
Szczegółowy opis  Flash PSD, 3.3V Supply, for 8-bit MCUs 2 Mbit 256 Kbit Dual Flash Memories and 64 Kbit SRAM
PDF  89 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PSD934210MIT Arkusz danych(HTML) 39 Page - STMicroelectronics

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PSD834F2V
Figure 17. An Example of a Typical 8-bit Non-Multiplexed Bus Interface
Data Byte Enable Reference. MCUs have differ-
ent data byte orientations. Table 15 shows how
the PSD interprets byte/word operations in differ-
ent 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 15. Eight-Bit Data Bus
Figure 18. MCU Bus Interface Examples
Figure 19 to Figure 22 show examples of the basic
connections between the PSD and some popular
MCUs. The PSD Control input pins are labeled as
to the MCU function for which they are configured.
The MCU bus interface is specified using the PS-
Dsoft Express Configuration.
80C31. Figure 19 shows the bus interface for the
80C31, which has an 8-bit multiplexed address/
data bus. The lower address byte is multiplexed
with the data bus. The MCU control signals Pro-
gram Select Enable (PSEN, CNTL2), Read Strobe
(RD, CNTL1), and Write Strobe (WR, CNTL0) may
be used for accessing the internal memory and I/
O Ports blocks. Address Strobe (ALE/AS, PD0)
latches the address.
MCU
WR
RD
BHE
ALE
RESET
D [ 7:0]
A[ 15:0]
A[ 23:16]
D [ 7:0]
ADIO
PORT
PORT
A
PORT
B
PORT
C
WR (CNTRL0)
RD (CNTRL1)
BHE (CNTRL2)
RST
ALE (PD0)
PORT D
(OPTIONAL)
PSD
AI02879C
BHE
A0
D7-D0
X
0
Even Byte
X
1
Odd Byte



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