D12320VF25V Datasheet, PDF (108/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 3 MCU Operating Modes
only be used in modes 1 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.
3.1.3 Register Configuration
The H8S/2319 Group has a mode control register (MDCR) that indicates the inputs at the mode
pins (MD2 to MD0), and a system control register (SYSCR) and system control register 2
(SYSCR2)*² that control the operation of the chip. Table 3.3 summarizes these registers.
Table 3.3 Registers
Name
Abbreviation
R/W
Initial Value
Address^*1
Mode control register
MDCR
R
Undefined
H'FF3B
System control register
SYSCR
System control register 2^*2 SYSCR2
R/W
H'01
R/W
H'00
H'FF39
H'FF42
Notes: 1. Lower 16 bits of the address.
2. The SYSCR2 register can only be used in the F-ZTAT versions. In the mask ROM and
ROMless versions this register will return an undefined value if read, and cannot be
modified.
3.2 Register Descriptions
3.2.1 Mode Control Register (MDCR)
Bit
:
7
6
5
4
—
—
—
—
Initial value :
1
0
0
0
R/W
:—
—
—
—
Note: * Determined by pins MD2 to MD0.
3
2
1
0
—
MDS2 MDS1 MDS0
0
—^*
—^*
—^*
—
R
R
R
MDCR is an 8-bit read-only register that indicates the current operating mode of the H8S/2319
Group chip.
Bit 7—Reserved: This bit is always read as 1, and cannot be modified.
Bits 6 to 3—Reserved: These bits are always read as 0, and cannot be modified.
Rev.7.00 Feb. 14, 2007 page 74 of 1108
REJ09B0089-0700