HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 109

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

3.3
3.3.1
The CPU can access a 64-kbyte address space in normal mode. The on-chip ROM is disabled.
Ports 1 and 2 function as an address bus, port 3 functions as a data bus, and part of port 9 carries
bus control signals. Clearing the ABW bit to 0 in the WSCR register makes port B a data bus.
3.3.2
The CPU can access a 16-Mbyte 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.
When the EXPE bit in MDCR is set to 1, ports 1, 2 and A function as input ports after a reset.
Ports 1, 2 and A output an address by setting 1 to the corresponding port data direction register
(DDR). Port 3 functions as a data bus, and parts of port 9 carry bus control signals. Port B
functions as a data bus when the ABW bit in WSCR is cleared to 0.
3.3.3
The CPU can access a 64-kbyte address space in normal mode. The on-chip ROM is enabled. The
CPU can access a 56-kbyte address space in mode 3.
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.
When the EXPE bit in MDCR is set to 1, 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, and parts of port 9 carry bus control signals. Port B
functions as a data bus when the ABW bit in WSCR is cleared to 0.
3.3.4
Pin functions of ports 1 to 3, 9, A, and B depend on the operating mode. Table 3.2 shows pin
functions in each operating mode.
Operating Mode Descriptions
Mode 1
Mode 2
Mode 3
Pin Functions in Each Operating Mode
Rev. 2.0, 08/02, page 69 of 788