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Section 3 MCU Operating Modes
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 H8/3067 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 H8/3067 Group has a mode control register (MDCR) that indicates the inputs at the mode
pins (MD
to MD
), and a system control register (SYSCR). Table 3.2 summarizes these registers.
2
0
Table 3.2
Registers
Address*
Name
H'EE011
Mode control register
H'EE012
System control register
Note: * Lower 20 bits of the address in advanced mode.
Rev. 4.00 Jan 26, 2006 page 64 of 938
REJ09B0276-0400
Abbreviation
R/W
MDCR
R
SYSCR
R/W
Initial Value
Undetermined
H'09
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