M16C26A Datasheet, PDF (6/352 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

3. Register Notation
The symbols and terms used in register diagrams are described below.
XXX Register
b7 b6 b5 b4 b3 b2 b1 b0
0
*1
Symbol
XXX
Bit Symbol
Bit Name
XXX0
XXX bits
XXX1
Address
XXX
After Reset
0016
b1 b0
1 0: XXX
0 1: XXX
1 0: Do not set.
1 1: XXX
Function
Nothing is assigned. If necessary, set to 0.
(b2)
When read, the content is undefined.
(b3)
Reserved bits
XXX4
XXX bits
XXX5
Set to 0.
Function varies according to the operating
mode.
XXX6
XXX7
XXX bit
0: XXX
1: XXX
RW
*2
RW
RW
*3
RW _*4
RW
WO
RW
RO
*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.