M16C80 Datasheet, PDF (3/358 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/80 SERIES

How to Use This Manual
1.Introduction
This hardware manual provides detailes information on the M16C/80 group microcomputers.
Users are exoected to have basic knowledge of electric circuits,logical circuits and microcomputers.
2.Register Diagram
The symbols,and descriptions,used for bit function in each register are shown below.
*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
b1 b0
1 0 : XXX
0 1 : XXX
1 0 : Inhibited
1 1 : XXX
Function
R
W
Nothing is assigned.
When write, set "0". When read, its content is indeterminate.
Reserved
bit
Must always b set to "0"
XXX
4
Function varies with each operation mode
XXX
5
*3
XXX
6
*1
XXX
XXX flag
7
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.
• Inhibited
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.
• Must be fixed to "0" in A mode
Set the bit concerned to "0" in A mode.
• 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.