Mitsubishi Electric M32R Series User Manual page 726

Mitsubishi 32-bit risc single-chip microcomputers

Table of Contents

(3) Using 8/16-bit data bus memories in combination when Bus Mode Control Register = 1

The diagram below shows a typical connection of external extension memory, with 8-bit data bus

memory located in the CS0 area, and 16-bit data bus memory located in the CS1 area. (External

extension memory can only be used in external extension mode and processor mode.)

Note : The QS32X2245 is a product made by IDT Company.

Figure 15.4.3 Typical Connection of External Extension Memory (Using 8/16-bit Mixed

Memories when BUSMOD = 1)

Note : The 32170 addresses and data are arranged in such a way that bit 0 = MSB, and bit 15 =

LSB. Therefore, the MSB and LSB sides must be reversed when connecting external

extension memory.

15.4 Typical Connection of External Extension Memory

When CL = 50 pF, memory can be connected with only 2 ns data delay

8-bit memory

Number of bus wait cycles can be set to 1-4.

Normally used as port. WAIT is used only when four or more wait cycles are needed.

EXTERNAL BUS INTERFACE

Memory mapping

Internal flash

memory (768KB)

8-bit bus area

16-bit bus area