Register Configuration; Register Descriptions; Mode Control Register (Mdcr) - Renesas H8S/2319 series Hardware Manual

17.1.2

Register Configuration

The operating mode of the chip is controlled by the mode pins and the BCRL register. The ROM-
related registers are shown in table 17-1.
Table 17-1 ROM Registers
Register Name
Mode control register
Bus controller register
Note: * Lower 16 bits of the address.
17.2

Register Descriptions

17.2.1

Mode Control Register (MDCR)

Bit : 7
—
Initial value : 1
R/W : —
Note: * Determined by pins MD2 to MD0.
MDCR is an 8-bit read-only register used to monitor the current operating mode of the chip.
Bit 7—Reserved: This bit cannot be modified and is always read as 1.
Bits 6 to 3—Reserved: These bits cannot be modified and are always read as 0.
Bits 2 to 0—Mode Select 2 to 0 (MDS2 to MDS0): These bits indicate the input levels at pins
MD2 to MD0 (the current operating mode). Bits MDS2 to MDS0 correspond to pins MD2 to
MD0. MDS2 to MDS0 are read-only bits, and cannot be modified. The mode pin (MD2 to MD0)
input levels are latched into these bits when MDCR is read. These latches are canceled by a reset.
Rev. 5.00, 12/03, page 552 of 1088
Abbreviation
MDCR
BCRL
6 5
— — —
0 0
— — —
R/W Initial Value
R/W Undefined
R/W Undefined
4 3 2
— MDS2
— *
0 0
— R
Address *
H'FF3B
H'FED5
1 0
MDS1 MDS0
— * — *
R R