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R-IN32M4-CL3 User's Manual: Board design edition
9.1
External MCU Interface
The external MCU interface is multiplexed with the external memory interface. When the MEMIFSEL pin is set to the
high level, it functions as the external MCU interface.
The external MCU interface supports the asynchronous-SRAM supporting MCU connection mode and the synchronous-
SRAM supporting MCU connection mode. When the level on the HIFSYNC pin is high, it functions as a synchronous
SRAM interface, and when HIFSYNC is set to low-level, it functions as an asynchronous SRAM interface (see Table
9.1, Mode Selection of External MCU/Memory Connection).
In addition, the external MCU interface supports the synchronous-burst-transfer supporting MCU connection mode of
clock synchronization, allowing access to large volumes of data at high speed. This function is enabled by setting the
MEMIFSEL and MEMCSEL pins to the high level.
Caution: The method of connection for each signal depends on the bus interface specifications of the
MCU to be connected.
Check the specifications of the product to be connected before determining the method.
R18UZ0074EJ0100
Dec 24, 2019
9. External MCU/Memory Interface Pins
Page 33 of 61
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