THREE-PHASE WAVEFORM MODE
10.2 Block description
10.2.5 Position-data-retain function control register
Figure 10.2.8 shows the structure of the position-data-retain function control register.
For details of the position-data-retain function, refer to section “10.6 Position-data-retain function.”
b7 b6 b5 b4 b3 b2 b1 b0
Position-data-retain function control register (Address AA16
)
Bit
0
Bit name
Function
At reset R/W
Input level at pin IDW is read out.
0 : “L” level
W-phase position data retain bit
0
0
0
RO
RO
RO
1 : “H” level
Input level at pin IDV is read out.
0 : “L” level
V-phase position data retain bit
U-phase position data retain bit
Retain-trigger polarity select bit
1
2
1 : “H” level
Input level at pin IDU is read out.
0 : “L” level
1 : “H” level
0 : Falling edge of positive phase
1 : Rising edge of positive phase
3
0
RW
7 to 4 Nothing is assigned.
Undefined
—
Note: This register is valid only in the three-phase mode.
Fig. 10.2.8 Structure of position-data-retain function control register
(1) W-phase position data retain bit (bit 0)
This bit is used to retain the input level at pin IDW.
(2) V-phase position data retain bit (bit 1)
This bit is used to retain the input level at pin IDV.
(3) U-phase position data retain bit (bit 2)
This bit is used to retain the input level at pin IDU.
(4) Retain-trigger polarity select bit (bit 3)
This bit is used to select the trigger polarity to retain the position data.
When this bit = “0,” the falling edge of each positive phase is selected.
When this bit = “1,” the rising edge of each positive phase is selected.
7906 Group User’s Manual Rev.2.0
10-12
RENESAS [ RENESAS TECHNOLOGY CORP ]
