Table of Contents
Advertisement
■ Mode Settings
For the MB91319, set the operating mode using the mode pins (MD3, MD2, MD1, and MD0) and
the mode register (MODR).
❍ Mode pins
Use the three mode pins (MD3, MD2, MD1, and MD0) to specify mode vector fetch.
MD3
0
0
Note:
Mode settings other than the above are prohibited.
❍ Mode register (MODR)
Mode data is data written to the mode register by a mode vector fetch (see "3.10.3 Reset
Sequence").
Mode data is always set in the mode register when any reset source arises. A user program
cannot write data to the mode register.
Note:
Nothing exists at the address (0000_07FF
Data can be rewritten to the mode register in emulator mode. Use an 8-bit long data transfer
instruction to rewrite data. A 16-bit or 32-bit long data transfer instruction cannot be used to
rewrite data to the mode register.
Figure 3.9-1 shows the bit configuration of the mode register (MODR).
MODR
000FFFF8
H
[bit7 to bit3] Reserved bits
These bits are reserved.
Mode pin
MD2
MD1
MD0
0
0
0
1
0
0
Figure 3.9-1 Bit Configuration of the Mode Register (MODR)
7
6
5
0
0
0
CHAPTER 3 CPU AND CONTROL UNITS
Reset vector
Mode name
access area
Internal ROM
Internal
mode vector
Serial write
mode vector
) of the MB91319 mode register.
H
4
3
2
0
0
1
WTH1
Operating mode setting bits
Remarks
-
-
Initial value
1
0
xxxxxxxx
WTH0
B
65
Advertisement
Table of Contents
