Mitsubishi Electric M32R Series User Manual page 715

Mitsubishi 32-bit risc single-chip microcomputers

Table of Contents

(11) Bus Mode Control Register (BUSMODC)

The 32170 contains a function to switch between two external bus modes.

Bus Mode Control Register (BUSMODC)

No functions assigned

(Bus mode control)

This register is used to facilitate memory connection in processor mode and external extension

When Bus Mode Control Register (BUSMOD) = 0, the WR signal is output separately for each byte

area. Signals RD, BHW, BLW, BCLK, and WAIT can be used. For memory connection in boot

mode, the Bus Mode Control Register has no effect and the interface operates under conditions

where Bus Mode Control Register (BUSMOD) = 0.

When Bus Mode Control Register (BUSMOD) = 1, the byte enable signal is output separately for

each byte area. Signals RD, BHW, BLE, WR, and WAIT can be used. For WAIT control circuit

configuration, because BCLK is not output, external timing control is required.

Figure 15.1.1 Pin Function when Bus Modes are Changed

0: WR signal separate mode

1: Byte enable separate mode

EXTERNAL BUS INTERFACE

15.1 External Bus Interface Related Signals

<Address: H'0080 077F>