HD6475348R Datasheet, PDF (45/487 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

2.2 Mode Descriptions
The five MCU modes are described below. For further information on the I/O pin functions in
each mode, see section 9, “I/O Ports.”
Mode 1 (Expanded Minimum Mode): Mode 1 supports a maximum 64-kbyte address space
which does not include any on-chip ROM. Ports 1 to 5 are used for bus lines and bus control
signals as follows:
Control signals: Ports 1* and 2
Data bus:
Port 3
Address bus: Ports 4 and 5
* The functions of individual pins of port 1 are software-selectable.
Mode 2 (Expanded Minimum Mode): Mode 2 supports a maximum 64-kbyte address space of
which the first part is in on-chip ROM. Ports 1 to 5 are used for bus lines and bus control signals
as follows:
Control signals: Ports 1* and 2
Data bus:
Port 3
Address bus: Ports 4 and 5*
* The functions of individual pins in ports 1 and 5 are software-selectable.
Note: In mode 2, port 5 is initially a general-purpose input port. Software must change it to
output before using it for the address bus. See section 9.6, “Port 5” for details. The following
instruction makes all pins of port 5 into output pins:
MOV.B #H'FF, @H'FE88*
* H'xx or H'xxxx express the hexadecimal number.
Mode 3 (Expanded Maximum Mode): Mode 3 supports a maximum 1-Mbyte address space
which does not include any on-chip ROM. Ports 1 to 6 are used for bus lines and bus control
signals as follows:
Control signals: Ports 1* and 2
Data bus:
Port 3
Address bus: Ports 4, 5, and 6
* The functions of individual pins of port 1 are software-selectable.
24