DS07-16303-3E Datasheet, PDF (21/97 Pages) Fujitsu Component Limited. – 32-bit RISC Microcontroller CMOS FR30 Series

MB91121
s SETTING MODE
1. Pin
• Mode setting pins and modes
Mode setting pins
MD3 MD2 MD1 MD0
Mode name
Reset vector
access area
1 0 0 0 External vector mode 0 External
1 0 0 1 External vector mode 1 External
1010


1 0 1 1 Internal vector mode
Internal
1 1 


0 


* : MB91121 does not support single-chip mode.
External data
bus width
Bus mode
8 bits
16 bits
External ROM/external
bus mode

Inhibited
(Mode register) Single-chip mode*

Inhibited

Inhibited
2. Registers
• Mode setting registers (MODR) and modes
Address
Initial value
Access
0000 07FFH
M1 M0
*
*
*
*
*
*
XXXX XXXXB
W
W : Write only
X : Indeterminate
* : Always write “0” except for M1 and M0.
Bus mode setting bit
• Bus mode setting bits and functions
M1
M0
Functions
0
0
Single-chip mode
0
1
Internal ROM/external bus mode
1
0
External ROM/external bus mode
1
1

Note : Because of without internal ROM, MB91121 allows “10B” setting value only.
Note
Inhibited
21