Rev. 1.0, 02/00, page 485 of 1141
23.2.8
DDC Switch Register (DDCSWR)
7
SWE
0
R/W
6
SW
0
R/W
5
IE
0
R/W
4
IF
0
R/(W)
*
1
3
CLR3
1
W
*
2
0
CLR0
1
W
*
2
2
CLR2
1
W
*
2
1
CLR1
1
W
*
2
Notes: 1.
2.
Only 0 can be written to clear the flag.
Always read as 1.
Bit :
Initial value :
R/W :
DDCSWR is an 8-bit read/write register that controls automatic format switching for IIC channel
0 and IIC internal latch clearing. DDCSWR is initialized to H'0F by a reset or in hardware standby
mode.
Bit 7
DDC Mode Switch Enable (SWE): Enables or disables automatic switching from
formatless transfer to I
2
C bus format transfer for IIC channel 0.
Bit 7
SWE
Description
0
Disables automatic switching from formatless transfer to I
2
C bus format transfer for
IIC channel 0.
(Initial value)
1
Enables automatic switching from formatless transfer to I
2
C bus format transfer for IIC
channel 0.
Bit 6
DDC Mode Switch (SW): Selects formatless transfer or I
2
C bus format transfer for IIC
channel 0.
Bit 6
SW
Description
0
I
2
C bus format is selected for IIC channel 0.
(Initial value)
[Clearing conditions]
1. When 0 is written by software
2. When an SCL falling edge is detected when SWE = 1
1
Formatless transfer is selected for IIC channel 0.
[Setting condition]
When 1 is written after SW = 0 is read