Rev. 1.0, 02/00, page 603 of 1141
DFG Reference Register 1 (DFCRA)
0
*
1
*
W
2
*
W
3
*
4
*
W
0
W
5
6
0
7
DFCRA4
DFCRA3
DFCRA2
DFCRA1
DFCRA0
0
W
ISEL2
W
W
W
CCLR
CKSL
Bit :
Initial value :
R/W :
Note : * Don't care
DFCRA is a register which determines the operation of the HSW timing generator as well as the
starting point of the timing of FIFO1.
DFCRA is an 8-bit write-only register. It is not initialized by a reset or in stand-by or module stop
mode; accordingly be sure to write data before use.
Note:
The same address is assigned to the DFCRA and the DFG reference counter register
(DFCTR). Accordingly, the value of DFCTR is read out in the low-order five bits if a
read is attempted.
Bit 7
Interrupt Selection Bit (ISEL2): Selects the interrupt source. (IRRHSW2)
Bit 7
ISEL2
Description
0
Generates an interrupt request by the clear signal of the 16-bit timer counter
(Initial value)
1
Generates an interrupt request by the VD signal in PB mode
Bit 6
DFG Counter Clear Bit (CCLR): Forcibly clears the 5-bit DFG counter by software.
After 1 is written, the bit immediately reverts to 0. Writing 0 in this bit has no effect.
Bit 6
CCLR
Description
0
Normal operation
(Initial value)
1
Clears the 5-bit DFG counter