
CHAPTER 9
PIU (TOUCH PANEL INTERFACE UNIT)
User’s Manual U14579EJ2V0UM
135
9.3.2
PIUINTREG (base address + 0x0A4)
Bit
1514
131211
10
9
8
Name
OVP
RFU
R/W
R
RRR
After reset
0
000
Bit
7
6
543
210
Name
RFU
PADCMD
INTR
PADADP
INTR
PADPAGE1
INTER
PADPAGE0
INTER
PADDLOST
INTR
RFU
PENCHG
INTR
R/W
R
R/W
R
R/W
After reset
0
000
Bit
Name
Function
15
OVP
Valid page ID bit (older valid page)
1: Valid data older than page 1 buffer data is retained
0: Valid data older than page 0 buffer data is retained
14:7
RFU
Reserved. Write 0 to these bits. 0 is returned after a read.
6
PADCMDINTR
PIU command scan interrupt. Cleared to 0 when 1 is written.
1: Indicates that command scan found valid data
0: Indicates that command scan did not find valid data in buffer
5
PADADPINTR
PIU A/D port scan interrupt. Cleared to 0 when 1 is written.
1: Indicates that A/D port scan found valid data with 1 value in buffer
0: Indicates that A/D port scan did not find valid data with 1 value in buffer
4
PADPAGE1INTER
PIU data buffer page 1 interrupt. Cleared to 0 when 1 is written.
1: Valid data with 1 value is stored in page 1 of data buffer
0: No valid data with 1 value in page 1 of data buffer
3
PADPAGE0INTER
PIU data buffer page 0 interrupt. Cleared to 0 when 1 is written.
1: Valid data with 1 value is stored in page 0 of data buffer
0: No valid data with 1 value in page 0 of data buffer
2
PADDLOSTINTR
Data lost interrupt. Cleared to 0 when 1 is written.
1: Not data with 1 value found within specified time
0: No timeout
1
RFU
Reserved. Write 0 to this bit. 0 is returned after a read.
0
PENCHGINTR
Change in touch panel contact state interrupt. Cleared to 0 when 1 is written.
1: Change has occurred
0: No change
This register sets and indicates the interrupt request generation of PIU.
When the TPY1 signal changes, the PENCHGINTR bit is set to 1.
When the PENCHGINTR bit is set to1, the PENSTC bit indicates the touch panel contact state (touch or release)
when a contact state changes. The PENSTC bit’s state remains until PENCHGINTR bit is cleared to 0. Also, when
PENCHGINTR bit is cleared to 0, PENSTC bit indicates the touch panel contact state. However, PENSTC bit does
not change while PENCHGINTR bit is set to 1, even if the touch panel contact state changes between release and
touch.