mb91307r Fujitsu Microelectronics, Inc., mb91307r Datasheet - Page 30

• Manufacturer Part Number: mb91307r
• Description: 32-bit Microcontroller Cmos Fr60 Mb91307 Series
• Manufacturer: Fujitsu Microelectronics, Inc.

30
MB91307 Series
1. Mode Pins
2. Mode Register (MODR)
<
[bit7 to bit3] Reserved bits
[bit2] ROMA (Internal RAM enable bit)
[bit1, 0] WTH1, WTH0 (Bus width indicator bits)
MD2
Detailed register description >
0
SETTING MODE
In the FR family, the mode pins (MD2, MD1, MD0) and the mode register (MODR) are used to set the operating
mode.
The three pins MD2, MD1, MD0 are used in mode vector fetch instructions, and also to make settings in test mode.
The mode data fetch instruction writes data to the address “0000 07FD
The area “0000 07FD
operate the mode corresponding to that setting.
The mode register can only be set by a reset source at the INIT level. It is not possible to write to this register
from a user program.
Note : No data exists at the FR family mode register address (0000 07FF
These bits should always be set to “00000.” If set to any other value, stable operation is not assured.
This bit indicates whether internal RAM is enabled.
In external bus mode, these bits determine the bus width setting.
In external bus mode, the value of these bits sets the BW1, 0 bits in the AMD0 register (CS0 area).
Mode pin
ROMA
MODR
Address
0000 07FD
MD1
0
1
0
WTH1
0
0
1
1
MD0
1
H
External ROM mode
Internal RAM mode
External ROM mode vector
H
” is the mode register (MODR). When a setting is made to this register, the device will
7
0
Mode name
Function
6
0
WTH0
5
0
0
1
0
1
4
0
Reset vector access area
3
0
8-bit
16-bit
Setting prohibited
Setting prohibited
The built-in RAM area functions as external area.
The built-in RAM area is enabled.
The 128K bytes built-in RAM can be used.
Outside
Operating mode setting bits
ROMA
2
WTH1
1
H
” called the mode data.
H
).
WTH0
Bus width is set by mode register.
Bus width
0
Remarks
XXXXXXXX
Default
Remarks
B