Rev. 1.0, 09/01, page 54 of 904
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
R/W
Descriptions
7
6
5
4
3
−
−
−
−
−
0
0
0
0
0
−
−
−
−
−
Reserved
These bits are always read as 0 and cannot be
modified.
2
1
0
MDS2
MDS1
MDS0
−
*
−
*
−
*
R
R
R
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.
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.
Summary of Contents for H8S/2376 F-ZTAT
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