M16C6K9 Datasheet, PDF (153/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
LPC Bus Interface
Data bus buffer control register 0
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
DBBCON0
Address
02C816
When reset
000000002
Bit symbol
Bit name
Nothing is assigned.
Cannot be written. The value is "0" in reading.
Function
RW
IBFSEL IBF/OBE
interrupt request select bit
b7 b6
(Note 1)
0 0 : OBE disable
0 1 : OBE enable, IBF1 disable
1 0 : OBE enable, IBF2 disable
1 1 : OBE enable, IBF3 disable
Note 1: By setting these two bits, one of IBF1 to IBF3 interrupt requests will be switched
to OBE interrupt request.
There is no relative between IBF0 interrupt request and these two bits.
Interrupt
b7, b6
IBF0 interrupt
IBF1 interrupt
IBF2 interrupt
IBF3 interrupt
0,0
IBF0
IBF1
IBF2
IBF3
0,1
IBF0
OBE
IBF2
IBF3
1,0
IBF0
IBF1
OBE
IBF3
1,1
IBF0
IBF1
IBF2
OBE
Data bus buffer control register 1
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
DBBCON1
Address
02C916
When reset
000000002
Bit symbol
Bit name
OBF0SEL OBF0 output selection bit
OBF00EN OBF00 output enable bit
OBF01EN OBF01 output enable bit
OBF1EN OBF1 output enable bit
OBF2EN OBF2 output enable bit
OBF3EN OBF3 output enable bit
Function
0 : OBF00 enable
1 : OBF01 enable
0 : P40 as GPIO
1 : P40 as OBF00 output
0 : P43 as GPIO
1 : P43 as OBF01 output
0 : P44 as GPIO
1 : P44 as OBF1 output
0 : P45 as GPIO
1 : P45 as OBF2 output
0 : P46 as GPIO
1 : P46 as OBF3 output
Nothing is assigned.
Cannot be written. The value is "0" in reading.
RW
Fig.GF-3 Data bus buffer control registers
Rev.1.00 Jun 06, 2003 page 153 of 290