
66
The H8S/2214 can be used only in modes 4 to 7. This means that the mode pins must be set to
select one of these modes. Do not change the inputs at the mode pins during operation.
3.1.2
Register Configuration
The H8S/2214 has a mode control register (MDCR) that indicates the inputs at the mode pins
(MD2 to MD0), and a system control register (SYSCR) that controls the operation of the
H8S/2214. Table 3-2 summarizes these registers.
Table 3-2
MCU Registers
Name
Abbreviation
R/WInitial Value
Address*
Mode control register
MDCR
R
Undetermined
H'FDE7
System control register
SYSCR
R/W
H'01
H'FDE5
Note: * Lower 16 bits of the address.
3.2
Register Descriptions
3.2.1
Mode Control Register (MDCR)
7
—
1
—
6
—
0
—
5
—
0
—
4
—
0
—
3
—
0
—
0
MDS0
—*
R
2
MDS2
—*
R
1
MDS1
—*
R
Note: * Determined by pins MD2 to MD0.
Bit
Initial value
R/W
:
MDCR is an 8-bit read-only register that indicates the current operating mode of the H8S/2214.
Bit 7—Reserved: Read-only bit, always read as 1.
Bits 6 to 3—Reserved: Read-only bits, always read as 0.
Bits 2 to 0—Mode Select 2 to 0 (MDS2 to MDS0): These bits indicate the input levels at pins
MD2 to MD0 (the current operating mode). Bits MDS2 to MDS0 correspond to MD2 to MD0.
MDS2 to MDS0 are read-only bits-they cannot be written to. The mode pin (MD2 to MD0) input
levels are latched into these bits when MDCR is read. These latches are canceled by a power-on
reset, but are retained after a manual reset.