參數(shù)資料
型號： M8803F3Y-90K1T
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 1M X 1 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQCC52
封裝： PLASTIC, LCC-52
文件頁數(shù)： 29/85頁
文件大?。?/td> 601K
代理商： M8803F3Y-90K1T
35/85
M88 FAMILY
Figu re 21. An Example of a Typical 8-bit Non-Multiplexed Bus Interface
MICRO -
CONTROLLER
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)
M88x3Fxx
AI02879
The Slave can also write to the Port A IMCs and
the Master can then read the IMCs directly.
Note that the “Slave-Read” and “Slave-Wr” signals
are product terms that are derived from the Slave
MCU inputs RD, WR, and Slave_CS.
Microcontroller Bus Interface
The
“no-glue
logic”
M88x3Fxx
FLASH+PSD
Microcontroller Bus Interface can be directly
connected to most popular microcontrollers and
their control signals. Key 8-bit microcontrollers
with their bus types and control signals are shown
in Table 19. The interface type is specified using
the PSDsoft Configuration.
Interfacing 16-bit MCUs with Two M88x3Fxx
FLASH+PSD Devices.
The M88x3Fxx FLASH+PSD has an internal 8-bit
data bus. Users of 16-bit data bus MCUs can
connect two M88x3Fxx FLASH+PSD devices in
parallel such that one is tied to the upper data byte
(D15-D8) and the other is connected to the lower
data
byte
(D7-D0).
Refer
to
M88x3Fxx
FLASH+PSD
Application
Notes
on
the
configuration of two M88x3Fxx FLASH+PSD to
16-bit MCUs.
M88x3Fxx FLASH+PSD Interface to a
Multiplexed 8-Bit Bus
Figure 20 shows an example of a syst em using a
microcontroller with an 8-bit multiplexed bus and a
M88x3Fxx FLASH+PSD. The ADIO port on the
M88x3Fxx FLASH+PSD is connected directly to
the microcontroller address/data bus. ALE latches
the address lines internally. Latched addresses
can be brought out to Port A or B. The M88x3Fxx
FLASH+PSD drives the ADIO data bus only when
one of its internal resources is accessed and the
RD input is active. Should the system address bus
exceed sixteen bits, Ports A, B, C, or D may be
used as additional address inputs.
M88x3Fxx FLASH+PSD Interface to a Non-
Multiplexed 8-Bit Bus
Figure 21 shows an example of a syst em using a
microcontroller with an 8-bit non-multiplexed bus
and a M88x3Fxx FLASH+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 M88x3Fxx FLASH+PSD is not accessed
by the microcontroller. Should the syst em address
bus exceed sixteen bits, Ports B, C, or D may be
used for additional address inputs.
Data Byte Enable Reference
Microcontrollers
have
different
data
byte
orientations. Table 20 shows how the M88x3Fxx
FLASH+PSD interprets byte/word operations in
different bus write configurations. Even-byte refers
to locations with address A0 equal to zero and odd
byte as locations with A0 equal to one.
Microcontroller Interface Examples
Figure 22 to Figure 26 show examples of the basic
connections between the M88x3Fxx FLASH+PSD
and
some
popular
microcontrollers.
The
M88x3Fxx FLASH+PSD Control input pins are
labeled as to the microcontroller function for which
they are configured. The MCU interface is
specified using the PSDsoft Configuration.
相關(guān)PDF資料
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