HD64F2145 Datasheet, PDF (104/829 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

3.2.1 Mode Control Register (MDCR)
MDCR is used to set an operating mode and to monitor the current operating mode.
Bit Bit Name Initial Value R/W Description
7 EXPE
—*
R/W* Extended Mode Enable
Specifies extended mode. Fixed to 1 and cannot be
modified in mode 1. Readable/writable and the initial
value is 0 in mode 2 or 3.
0: Single-chip mode
1: Extended mode
6—
All 0
to
2
R
Reserved
These bits are always read as 0. These bits cannot be
modified.
1 MDS1
—*
R
Mode Select 1 and 0
0 MDS0
—*
R
These bits indicate the input levels at mode pins (MD1
and MD0) (the current operating mode). Bits MDS1
and MDS0 correspond to MD1 and MD0, respectively.
These bits are read-only bits and they cannot be
written to. The mode pin (MD1 and MD0) input levels
are latched into these bits when MDCR is read. These
latches are canceled by a reset.
Note:* The initial values are determined by the settings of the MD1 and MD0 pins.
Rev. 2.0, 08/02, page 64 of 788