Operation Mode; Table 2.10-1 Mode Pins And Setting Modes - Fujitsu MB91F109 FR30 Hardware Manual

2.10 Operation Mode

Two operation modes, bus mode and access mode, are available.
The mode pins (MD2, MD1, and MD0) and mode register (MODR) are used to control
the operation mode.
Operation Mode
Two operation modes, bus mode and access mode, are available.
Bus mode
In bus mode, the operations of internal ROM and external access functions are controlled. The
mode pins (MD2, MD1, MD0), and the M1 and M0 bits of the mode register (MODR) are used
for control in this mode.
Access mode
In access mode, external data bus width is controlled. The mode pins (MD2, MD1, MD0), and
the BW1 and BW0 bits of the area mode registers (AMD0, AMD1, AMD32, AMD4, AMD5) are
used for control in this mode.
Mode Pins
Three mode pins, MD2, MD1, and MD0, are used for operation specification as shown in Table
2.10.1.

Table 2.10-1 Mode Pins and Setting Modes

Mode pins
MD
2
0
0
0
0
1
Bus mode
Single chip
Internal-ROM-external bus
External-ROM-external bus
Mode name
MD1 MD
0
0 0 External
vector mode 0
0 1 External
vector mode 1
1 0 -
1 1 Internal vector
mode
- - -
Access mode
@ @ @ @ @ @ @ @
16-bit bus width
8-bit bus width
Reset External data
vector bus width
access area
External
External
-
Internal (Mode register)
-
2.10 Operation Mode
Remarks
8 bit External-ROM-
external bus mode
16 bit External-ROM-
external bus mode
- Reserved
Single chip mode
- Reserved
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