Register Configuration; Mode Control Register (Mdcr) - Hitachi H8/3062 Hardware Manual

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 in which the chip operates using only the on-chip ROM,
RAM, and I/O registers. All ports are available in these modes. Mode 6 supports a maximum
address space of 64 kbytes. Mode 7 supports a maximum address space of 1 Mbyte.
The H8/3062 Series 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. Set the
reset state before changing the inputs at these pins.
3.1.2

Register Configuration

The H8/3062 Series 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.
3.2

Mode Control Register (MDCR)

MDCR is an 8-bit read-only register that indicates the current operating mode of the
H8/3062 Series.
Bit
—
Initial value
Read/Write —
Note: * Determined by pins MD to MD .
68
7 6 5
— —
1 1 0
— —
Reserved bits
2 0
Abbreviation R/W
MDCR R
SYSCR R/W
4 3
— —
0 0
— —
Initial Value
Undetermined
H'09
2 1
MDS2 MDS1 MDS0
— * — *
R R
Mode select 2 to 0
Bits indicating the current
operating mode
0
— *
R