參數(shù)資料
型號(hào): PSD4256G6V-10UIT
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 1M X 8 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝: PLASTIC, TQFP-80
文件頁數(shù): 90/127頁
文件大?。?/td> 1091K
代理商: PSD4256G6V-10UIT
PSD4256G6V
MCU bus interface
18.2
PSD interface to a non-multiplexed, 16-bit bus
Figure 19 shows an example of a system using an MCU with a 16-bit, non-multiplexed bus
and a PSD4256G6V. The address bus is connected to the ADIO port, and the data bus is
connected to Ports F and G. Ports F and G are in tri-state mode when the PSD is not
accessed by the MCU. Should the system address bus exceed sixteen bit, Ports A, B, or C
may be used for additional address inputs.
Figure 19.
An example of a typical non-multiplexed bus interface
1.
D[15:8] is for 16-bit MCU
18.3
Data byte enable reference for a 16-bit bus
MCUs have different data byte orientations. Table 36 to Table 39 show how the PSD3200
Family interprets byte/word operations 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
WR
RD
BHE
ALE
RESET
D [ 15:0]
A[ 15:0]
D[15:8]1
D [ 7:0]
ADIO
PORT
F
PORT
G
PORT
A
WR (CNTRL0)
RD (CNTRL1)
BHE (CNTRL2)
RST
ALE (PD0)
PORT D
PSD
AI04929B
A[ 23:16]
(OPTIONAL)
Table 36.
16-bit data bus with BHE
BHE
A0
D15-D8
D7-D0
0
Odd byte
Even byte
01
Odd byte
10
Even byte
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