HD64F3039F18 Datasheet, PDF (82/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 3 MCU Operating Modes
Mode 5 is externally expanded mode that enables access to external memory and peripheral
devices and also enables access to the on-chip ROM. Mode 5 supports a maximum address space
of 1 Mbyte.
Modes 6 and 7 are single-chip modes that operate using the on-chip ROM, RAM, and registers.
All I/O ports are available. Mode 6 is a normal mode with 64-kbyte address space. Mode 7 is an
advanced mode with a maximum address space of 1 Mbyte.
The H8/3039 Group can be used only in modes 1, 3, or 5 to 7. The inputs at the mode pins must
select one of these seven modes. The inputs at the mode pins must not be changed during
operation.
3.1.2 Register Configuration
The H8/3039 Group has a mode control register (MDCR) that indicates the inputs at the mode
pins (MD₂ to MD₀), and a system control register (SYSCR). Table 3.2 summarizes these registers.
Table 3.2 Registers
Address* Name
Abbreviation
R/W
H'FFF1
Mode control register
MDCR
R
H'FFF2
System control register
SYSCR
R/W
Note: * The lower 16 bits of the address are indicated.
Initial Value
Undetermined
H'0B
Rev.3.00 Mar. 26, 2007 Page 58 of 682
REJ09B0353-0300