HD64F3028F25 Datasheet, PDF (88/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Mode 5 is an 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 16 Mbytes.
Modes 6 and 7 are single-chip modes that operate using the on-chip ROM, RAM, and registers,
and makes all I/O ports available. Mode 6 supports a maximum address space of 64 kbytes. Mode
7 supports a maximum address space of 1 Mbyte.
The H8/3028 Group can be used only in modes 1 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 H8/3028 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'EE011
Mode control register
MDCR
R
H'EE012
System control register SYSCR
R/W
Note: * Lower 20 bits of the address in advanced mode.
Initial Value
Undetermined
H'09
Rev. 2.00, 09/03, page 56 of 890