Register Descriptions; Mode Control Register (Mdcr); System Control Register (Syscr) - Hitachi H8S/2378, H8S/2378R Series Hardware Manual

3.2

Register Descriptions

The following registers are related to the operating mode.

• Mode control register (MDCR)

• System control register (SYSCR)

3.2.1 Mode Control Register (MDCR)
MDCR monitors the current operating mode of the H8S/2378 Series chip.
Bit Bit Name Initial Value
−
7 0
−
6 0
−
5 0
−
4 0
−
3 0
−
2 MDS2
−
1 MDS1
−
0 MDS0
Note: * Determined by pins MD2 to MD0.
3.2.2 System Control Register (SYSCR)
SYSCR controls CPU access to the flash memory control registers, sets external bus mode, and
enables or disables on-chip RAM.
Rev. 1.0, 09/01, page 54 of 904
R/W
−
−
−
−
−
R
*
R
*
R
*
Descriptions
Reserved
These bits are always read as 0 and cannot be
modified.
Mode Select 2 to 0
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 and 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
reset.