Outline Of Memory Access Modes - Fujitsu MB90390 Series Hardware Manual

CHAPTER 9 MEMORY ACCESS MODES
9.1

Outline of Memory Access Modes

2
In the F MC-16LX, the following two memory access modes are provided for each of the
access methods and access areas:
• Operation mode
• Bus mode
■ Memory access Modes
For the MB90390 Series, the external bus function is not supported. Therefore the following part of this
document is not fully supported. In user applications, please use the MB90390 Series in the single chip
mode.
To set the MB90390 Series into the single chip mode, the mode inputs (MD2 to MD0) should be "011
and the most significant two bits of the mode data (M1 and M0) should be "00
●
Operation mode
Operation mode means the mode for controlling the device operation status. The operation mode is
specified by the MDx mode setting pin and the Mx bit in mode data.
●
Bus mode
Bus mode means the mode for controlling the built-in ROM operation and external access function. The
bus mode is specified by the MDx mode setting pin and the Mx bit in mode data. The MDx mode setting
pin specifies the bus mode for reading the reset vector and mode data, and the Mx bit in mode data
specifies the bus mode for normal operation.
164
Operation mode
RUN Single chip
Flash programming
Bus mode
".
B
"
B