38K2 Datasheet, PDF (77/151 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

38K2 Group
b7
000 00
b0
EXB index register (EXBINDEX) [address 003316]
Bit symbol
Bit name
INDEX
[2:0]
Index bits
b7:b3
Not used
Function
At reset _{R W}
H/W S/W
The accessible register, using the register window, 0
depends on these index bits contents as follows:
– _OO
b2b1b0
0 0 0 : External I/O configuration register
0 0 1 : Transmit/Receive buffer register
0 1 0 : Memory channel operation mode register
0 1 1 : Memory address counter
1 0 0 : End address register
1 0 1 : Do not set.
1 1 0 : Do not set.
1 1 1 : Do not set.
Write “0” when writing.
“0” is read when reading.
– – _OO
–: State remaining
Fig. 111 Structure of EXB index register
b7
b0
Register window 1 (EXBREG1) [address 003416]
Bit symbol
LOW_WIN –
[7:0]
Bit name
Function
At reset _{R W}
H/W S/W
The accessible register, using this register window, In- In- _{O O}
depends on the EXB index register contents as definite definite
follows:
Index value
“0016” : External I/O configuration register
“0116” : Transmit/Receive buffer register
“0216” : Memory channel operation mode register
“0316” : Memory address counter
“0416” : End address register
Fig. 112 Structure of Register window 1
b7
b0
Register window 2 (EXBREG2) [address 003516]
Bit symbol
HIGH_WIN –
[7:0]
Bit name
Function
At reset _{R W}
H/W S/W
The accessible register, using this register window, In- In- _{O O}
depends on the EXB index register contents as definite definite
follows:
Index value
“0016” : External I/O configuration register
“0116” : Transmit/Receive buffer register
“0216” : Memory channel operation mode register
“0316” : Memory address counter
“0416” : End address register
Fig. 113 Structure of Register window 2
Rev.3.00 Oct 15, 2006 page 77 of 147
REJ03B0193-0300