參數(shù)資料
型號: PSD854F2V-15M
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 256K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQFP52
封裝: PLASTIC, QFP-52
文件頁數(shù): 50/109頁
文件大?。?/td> 908K
代理商: PSD854F2V-15M
Obsolete
Product(s)
- Obsolete
Product(s)
45/109
PSD813F2V, PSD854F2V
Doc ID 10552 Rev 3
PSD Interface to a Non-Multiplexed 8-Bit Bus
Figure 20 shows an example of a system using a
MCU with an 8-bit non-multiplexed bus and a
PSD. The address bus is connected to the ADIO
Port, and the data bus is connected to Port A. Port
A is in tri-state mode when the PSD is not ac-
cessed by the MCU. Should the system address
bus exceed sixteen bits, Ports B, C, or D may be
used for additional address inputs.
Data Byte Enable Reference
MCUs have different data byte orientations. Table
17 shows how the PSD interprets byte/word oper-
ations 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.’
MCU Bus Interface Examples
Figure 21 through 25 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 PSD-
soft Express Configuration.
Table 17. Eight-Bit Data Bus
Figure 20. An Example of a Typical 8-bit Non-Multiplexed Bus Interface
BHE
A0
D7-D0
X
0
Even Byte
X
1
Odd Byte
MCU
WR
RD
BHE
ALE
RESET
D [ 7:0]
A[ 15:0]
A[ 23:16]
D [ 7:0]
ADIO
PORT
A
PORT
B
PORT
C
WR (CNTRL0)
RD (CNTRL1)
BHE (CNTRL2)
RST
ALE (PD0)
PORT D
(OPTIONAL)
PSD
AI02879C
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