參數(shù)資料
型號: PSD813F2-15JT
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 128K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQCC52
封裝: PLASTIC, LCC-52
文件頁數(shù): 41/103頁
文件大?。?/td> 1180K
代理商: PSD813F2-15JT
PSD8XXF2/3/4/5
42/103
PSD8XXFX Interface to a Non-Multiplexed 8-Bit
Bus. Figure 18 shows an example of a system us-
ing a MCU with an 8-bit non-multiplexed bus and
a PSD8XXFX. 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
PSD8XXFX is not accessed by the MCU. Should
the system address bus exceed sixteen bits, Ports
B, C, or D may be used for additional address in-
puts.
Data Byte Enable Reference. MCUs have differ-
ent data byte orientations. Table 16 shows how
the PSD8XXFX interprets byte/word operations in
different bus WRITE configurations. Even-byte re-
fers to locations with address A0 equal to 0 and
odd byte as locations with A0 equal to 1.
Table 16. Eight-Bit Data Bus
Figure 18. 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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