psd4235g2v STMicroelectronics, psd4235g2v Datasheet - Page 61

• Manufacturer Part Number: psd4235g2v
• Description: Flash In-system Programmable Isp Peripherals For 16-bit Mcus 3.3 V Supply
• Manufacturer: STMicroelectronics

PSD4235G2V
Figure 15. Input macrocell
Input macrocells (IMC) are particularly useful with handshaking communication applications
where two processors pass data back and forth through a common mailbox.
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.
ENABLE ( .OE )
PT
PT
FEEDBACK
MACROCELLS A
MACROCELLS B
OUTPUT
INPUT MACROCELL _ RD
AND
MUX
D FF
LATCH
Q
Q
G
D
D
INTERNAL DATA BUS
INPUT MACROCELL
MUX
PT
ALE/AS
DIRECTION
REGISTER
Complex PLD (CPLD)
DRIVER
PORT
Figure 17
AI04926
I/O PIN
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