Mitsubishi 32172 User Manual page 740

17
17.4 Example for Connecting External Extension Memory
(1) When Bus Mode Control Register = 0 (with two memory blocks connected)
Figure 17.4.1 shows a typical connection diagram for the microcomputer when using external
extension memory (external extended mode).
M32172F2
A12
A30
D0
D15
RD
CS0
BHW
BLW
CS1
WAIT
Figure 17.4.1 Typical Connection of External Extension Memory Using Two Memory Blocks
(when BUSMOD = 0)
Note: The M32R/E address and data are comprised of bit 0 = MSB and bit 15 = LSB.
When connecting external extension memory to the chip, the MSB and the LSB sides
must be reversed.
17.4 Example for Connecting External Extension Memory
Flash memory
A18
A0
D15
max1MB
D0
RD
CS
SRAM
A17
A0
D15
max512KB*2
(total1MB)
D0
WR(D0-D7)
WR(D8-D15)
RD(D0-D15)
CS
Bus wait states can be set to 1 through 4.
Normally used for port function. Use WAIT only when four or more wait states are required.
17-22
EXTERNAL BUS INTERFACE
Memory mapping
H'0000 0000
Internal flash memory
(256KB)
H'0004 0000
Unused
H'000F FFFF
H'0010 0000
External memory area
(1MB)
H'001F FFFF
H'0020 0000
External memory area
(1MB)
H'0030 0000
Ghost area
H'0040 0000
1M-CS0 area
2M-CS1 area
Rev.1.0