M16C62_M Datasheet, PDF (6/615 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

The figure of each register configuration describes its functions and attributes as follows :
*1
*2
XXX register
b7 b6 b5 b4 b3 b2 b1 b0
0
Symbol
XXX
Address
XXX
When reset
0016
Bit symbol
XXX0
Bit name
XXX select bit
XXX1
Function
b1 b0
1 0 : XXX
0 1 : XXX
1 0 : Must not be set
1 1 : XXX
RW
Nothing is assigned.
In an attempt to write to this bit, write "0". The value, if read, turns out to be indeterminate.
Reserved bit
Must always be set to "0"
XXX4
Function varies with each operation mode
XXX5
*3
XXX6
XXX7
XXX flag
*1
Blank:Set to "0" or "1" according to intended use
0: Set to "0"
1: Set to "1"
X: Nothing is assigned
*2
R: Read
O.....Possible to read
X.....Impossible to read
–.....Nothing is assigned
W: Write
O.....Possible to write
X.....Written value is invalid
When write, value can be "0" or "1"
–.....Nothing is assigned
*3
Terms to use here are explained as follows.
• Nothing is assigned
Nothing is assigned to the bit concerned. When write, set "0" for new function in
future plan.
• Must not be set
Not select. The operation at having selected is not guaranteed.
• Reserved bit
Reserved bit. Set the specified value.
• Function varies with each operation mode
Bit function changes according to the mode of peripheral functions.
• Invalid in A mode
The bit concerned has no function in A mode. Set the specified value.
• Valid when bit A="0"
When bit A is "1", the bit concerned has no function. When bit A is "0", the bit
concerned has function.