h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 113

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

3.3.2
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.
In extended mode, 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 6 functions as a data bus when the
ABW bit in WSCR is cleared to 0.
3.3.3
Pin functions of ports 1 to 3, 6, 9, and A depend on the operating mode. Table 3.2 shows pin
functions in each operating mode.
Table 3.2
Legend:
*: After reset
Port
Port 1
Port 2
Port 3
Port 6
Port 9
Port A
P97
P96
P95 to P93
P90
Mode 3
Pin Functions
Pin Functions in Each Operating Mode
I/O port * /Address bus output
I/O port * /Address bus output
I/O port * /Data bus I/O
I/O port * /Data bus I/O
I/O port * /Control signal output
Input port * /Clock I/O
I/O port * /Control signal output
I/O port * /Control signal output
I/O port * /Address bus output
Mode 2
Rev. 3.00 Jan 25, 2006 page 61 of 872
Mode 3
I/O port * /Address bus output
I/O port * /Address bus output
I/O port * /Data bus output
I/O port * /Data bus output
I/O port * /Control signal output
Input port * /Clock I/O
I/O port * /Control signal output
I/O port * /Control signal output
I/O port *
Section 3 MCU Operating Modes
REJ09B0286-0300