Renesas R8C/18 Series Hardware Manual page 6

3. Register Notation
The symbols and terms used in register diagrams are described below.
XXX Register
b7 b6 b5 b4 b3 b2
0
*1
Blank: Set to 0 or 1 according to the application.
0: Set to 0.
1: Set to 1.
X: Nothing is assigned.
*2
RW: Read and write.
RO: Read only.
WO: Write only.
−: Nothing is assigned.
*3
• Reserved bit
Reserved bit. Set to specified value.
*4
• Nothing is assigned
Nothing is assigned to the bit. As the bit may be used for future functions, if necessary, set to 0.
• Do not set to a value
Operation is not guaranteed when a value is set.
• Function varies according to the operating mode.
The function of the bit varies with the peripheral function mode. Refer to the register diagram for information
on the individual modes.
*1
b1 b0
Symbol
XXX
Bit Symbol Bit Name
XXX bits
XXX0
XXX1
Nothing is assigned. If necessary, set to 0.
(b2)
When read, the content is undefined.
Reserved bits
(b3)
XXX bits
XXX4
XXX5
XXX6
XXX bit
XXX7
Address After Reset
XXX 00h
Function
b1 b0
1 0: XXX
0 1: XXX
1 0: Do not set.
1 1: XXX
Set to 0.
Function varies according to the operating
mode.
0: XXX
1: XXX
RW
*2
RW
RW
*3
RW
*4
RW
WO
RW
RO