HD64F2168 Datasheet, PDF (98/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

3.3 Operating Mode Descriptions
3.3.1 Mode 2
The CPU can access a 16 Mbytes address space in advanced mode. The on-chip ROM is enabled.
After a reset, the LSI is set to single-chip mode. To access an external address space, bit EXPE in
MDCR should be set to 1.
Normal extended mode:
In extended modes, ports 1 and 2 function as input ports after a reset.
Ports 1 and 2 function as an address bus by setting 1 to the corresponding port data direction
register (DDR). Port 3 functions as a data bus port, and parts of port 9 carry bus control signals.
Port 6 functions as a data bus port when the ABW bit in WSCR is cleared to 0.
Multiplex extended mode:
When 8-bit bus is specified, port 2 functions as the port for address output and data input/output
regardless of the setting of the data direction register (DDR). Port 1 can be used as a general port.
When 16-bit bus is specified, ports 1 and 2 function as the port for address output and data
input/output regardless of the setting of the data direction register (DDR).
3.3.2 Pin Functions in Each Operating Mode
Pin functions of ports 1 to 3, 6, 9, and A depend on the extended mode. Table 3.2 shows pin
functions in each operating mode.
Rev. 3.00, 03/04, page 58 of 830