Register Descriptions; Mode Control Register (Mdcr) - Renesas H8SX/1520 Series Hardware Manual

Section 3 MCU Operating Modes
3.2

Register Descriptions

The following registers are related to the operating mode setting.

• Mode control register (MDCR)

• System control register (SYSCR)
3.2.1 Mode Control Register (MDCR)
MDCR indicates the current operating mode. When MDCR is read, the states of signals input on
pins MD1 and MD0 are latched. The latch is released by a reset.
Bit
Bit Name
Initial Value
R/W
Bit
Bit Name
Initial Value
R/W
Note: * Determined by pins MD1 and MD0.
Bit Bit Name

15

14

13

12
11 MDS3
10 MDS2
9 MDS1
8 MDS0
Rev. 3.00 Mar. 14, 2006 Page 68 of 804
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15 14 13
— — —
0 1 0
R R R
7 6 5
— — —
0 1 0
R R R
Initial Value R/W
0 R
1 R
0 R
1 R
Undefined* R
Undefined* R
Undefined* R
Undefined* R
12 11
— MDS3
1 Undefined*
R R
4 3
— —
1 Undefined*
R R
Descriptions
Reserved
These are read-only bits and cannot be modified.
Mode Select 3 to 0
These bits indicate the operating mode selected by the
mode pins (MD1 and MD0) (see table 3.2).
10 9
MDS2 MDS1
Undefined* Undefined* Undefined*
R R
2 1
— —
Undefined* Undefined* Undefined*
R R
8
MDS0
R
0
—
R