R-IN32M3 Datasheet, PDF (58/116 Pages) Renesas Technology Corp – LSI for Industrial Ethernet

R-IN32M3 Series Data Sheet
3. Specifications
3.14 External MCU Interface
The external MCU interface is used to connect external MCUs. It functions both as an I/O port and an interface with
external memory. The pin for the external MCU interface also functions for the external memory interface. The external
MCU interface can be used when the high level is applied to the MEMIFSEL pin. After the power for the module is
turned on, the level of the pin needs to be determined before the module is released from a reset state. This module does
not support dynamic switching of levels.
3.14.1 Features
(1) External MCU interface <R>
- Interface system
 Asynchronous SRAM with wait control (for reading and writing)
 Page ROM reading with wait control
- Synchronous relationship (set up with the HIFSYNC pin)
 HBUSCLK synchronous mode (max. 50 MHz), asynchronous mode
Caution: Drive the HBUSCLK pin to low when asynchronous mode is to be used.
- Bus width (set up with the BUS32EN pin )
 32 bits / 16 bits
Remark: The module does not support 8-bit bus width.
- Transfer data size
 32 bits / 16 bits / 8 bits
- Buffers
 Write buffer: Two stages (synchronous mode is selected) or one stage (asynchronous mode is selected)
 Read buffer: Advance reading of up to 32 bytes is possible.
- Transfer type
 Single transfer
 Page read transfer
- Timing control function
R18DS0008EJ0401
Feb 28, 2017
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