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PSD4235G2 数据表(PDF) 41 Page - STMicroelectronics

部件名 PSD4235G2
功能描述  Flash In-System-Programmable Peripherals for 16-Bit MCUs
PDF  93 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PSD4235G2 数据表(HTML) 41 Page - STMicroelectronics

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PSD4000 Series
Preliminary Information
38
9.3.3 Data Byte Enable Reference
Microcontrollers have different data byte orientations. The following tables show how the
PSD4135G2 interprets byte/word operation in different bus write configurations. Even-byte
refers to locations with address A0 equal to zero and odd byte as locations with A0 equal
to one.
9.3.4 Microcontroller Interface Examples
Figures 14 through 17 show examples of the basic connections between the PSD4135G2
and some popular microcontrollers. The PSD4135G2 Control input pins are labeled as the
microcontroller function for which they are configured. The MCU interface is specified using
PSDsoft. The PE6 pin should be grounded if Vstby is not used.
9.3.4.1 80C196 and 80C186
In Figure 14, the Intel 80C196 microcontroller, which has a multiplexed sixteen-bit bus, is
shown connected to a PSD4135G2. The WR and RD signals are connected to the
CNTL0-1 pins. The BHE signal is used for high data byte selection. If BHE is not used, the
PSD can be configured to receive the WRL and WRH from the MCU. Higher address
inputs (A16-A19) can be routed to Port A, B or C as inputs to the PLD.
The AMD 80186 family has the same bus connection to the PSD as the 80C196.
BHE
A0
D15-D8
D7-D0
0
0
Odd Byte
Even Byte
0
1
Odd Byte
–
1
0
–
Even Byte
Table 15. 16-Bit Data Bus with BHE
The
PSD4000
Functional
Blocks
(cont.)
WRH
WRL
D15-D8
D7-D0
0
0
Odd Byte
Even Byte
0
1
Odd Byte
–
1
0
–
Even Byte
Table 16. 16-Bit Data Bus with WRH and WRL
SIZ0
A0
D15-D8
D7-D0
0
0
Even Byte
Odd Byte
1
0
Even Byte
–
1
1
–
Odd Byte
Table 17. 16-Bit Data Bus with SIZ0, A0 (Motorola MCU)
LDS
UDS
D15-D8
D7-D0
0
0
Even Byte
Odd Byte
1
0
Even Byte
–
0
1
–
Odd Byte
Table 18. 16-Bit Data Bus with UDS, LDS (Motorola MCU)



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