參數(shù)資料
型號(hào): PSD4235G2-90UT
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 256K X 16 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝: PLASTIC, TQFP-80
文件頁(yè)數(shù): 44/100頁(yè)
文件大?。?/td> 933K
代理商: PSD4235G2-90UT
PSD4235G2
48/100
PSD Interface to a Multiplexed Bus
Figure 19 shows an example of a system using a
MCU with a 16-bit multiplexed bus and a
PSD4235G2. The ADIO port on the PSD is con-
nected directly to the MCU address/data bus. Ad-
dress Strobe (ALE/AS, PD0) latches the address
signals internally. Latched addresses can be
brought out to Port E, F or G. The PSD drives the
ADIO data bus only when one of its internal re-
sources is accessed and Read Strobe (RD,
CNTL1) is active. Should the system address bus
exceed sixteen bits, Ports A, B, C, or F may be
used as additional address inputs.
Figure 19. An Example of a Typical 16-bit Multiplexed Bus Interface
MCU
WR
RD
BHE
ALE
RESET
AD [ 7:0]
AD[15:8]1
A[ 15: 8]
A[ 7: 0]
ADIO
PORT
F
PORT
G
PORT
A
WR (CNTRL0)
RD (CNTRL1)
BHE (CNTRL2)
RST
ALE (PD0)
PORT D
(OPTIONAL)
PSD
AI04928B
A[ 23:16]
(OPTIONAL)
or A[15:8]
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