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PSD4235G2V bảng dữ liệu(PDF) 61 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Flash in-system programmable (ISP) peripherals for 16-bit MCUs (3.3 V supply)
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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PSD4235G2V bảng dữ liệu(HTML) 61 Page - STMicroelectronics

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Complex PLD (CPLD)
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Input macrocells (IMC) are particularly useful with handshaking communication applications
where two processors pass data back and forth through a common mailbox. Figure 17
shows a typical configuration where the Master MCU writes to the Port A Data Out register.
This, in turn, can be read by the Slave MCU via the activation of the “Slave-Read” output
enable product term.
The Slave can also write to the Port A input macrocells (IMC) and the Master can then read
the input macrocells (IMC) directly.
Note that the “Slave-Read” and “Slave-Wr” signals are product terms that are derived from
the Slave MCU inputs Read Strobe (RD, CNTL1), Write Strobe (WR/WRL, CNTL0), and
Slave_CS.
Figure 15.
Input macrocell
OUTPUT
MACROCELLS A
AND
MACROCELLS B
PT
PT
FEEDBACK
PORT
DRIVER
I/O PIN
INTERNAL DATA BUS
DIRECTION
REGISTER
MUX
MUX
ALE/AS
PT
Q
Q
D
D
G
LATCH
INPUT MACROCELL
ENABLE (.OE)
D FF
INPUT MACROCELL _ RD
AI04926



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