參數(shù)資料
型號: PSD813F2A
廠商: 意法半導(dǎo)體
英文描述: Flash In-System Programmable(ISP) Peripherals For 8-bit MCUs(用于八位MCU的閃速在系統(tǒng)可編程外圍芯片)
中文描述: Flash在系統(tǒng)可編程(ISP)為周邊8位微控制器(用于八位微控制器的閃速在系統(tǒng)可編程外圍芯片)
文件頁數(shù): 42/103頁
文件大小: 1180K
代理商: PSD813F2A
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
PORT
A
PORT
B
PORT
C
WR (CNTRL0)
RD (CNTRL1)
BHE (CNTRL2)
RST
ALE (PD0)
PORT D
(OPTIONAL)
PSD
AI02879C
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