Datasheet

667
The operating mode determines whether the on-chip ROM is valid or not. The operating mode is
selected using mode-setting pins MD3–MD0 as shown in table 20.1. If you are using the on-chip
ROM, select mode 2 or mode 3; if you are not, select mode 0 or 1. The on-chip ROM is allocated
to addresses H'00000000–H'0000FFFF of memory area 0 for the 64-kbyte version, H'00000000–
H'0001FFFF of memory area 0 for the 128-kbyte version and H'00000000–H'0003FFFF of
memory area 0 for the 256-kbyte version.
Table 20.1 Operation Modes and ROM
Mode Setting Pin
Operation Mode MD3 MD2 MD1 MD0 Area 0
Mode 0 (MCU mode 0) **0 0 On-chip ROM invalid, external 8-bit space (112
pin and 120 pin), external 16-bit space (144 pin)
Mode 1 (MCU mode 1) **0 1 On-chip ROM invalid, external 16-bit space (112
pin and 120 pin), external 32-bit space (144 pin)
Mode 2 (MCU mode 2) **1 0 On-chip ROM valid, external space (bus width set
with bus state controller)
Mode 3 (MCU mode 3) **1 1 On-chip ROM valid, single-chip mode
0: Low
1: High
*: Refer to section 3, Operating Modes.