TTP259
TonTouchTM
Preliminary
3. IO Pad Cells
The main features of IO pad cell are including ESD/EFT protection and
general IO access. A general IO pad cell can be configured as input with or
without pull-up resistor, or working as a CMOS or NMOS output driver. The
input pad cell must have pull-up resistor for avoiding a floating state when
user doesn’t care or not be used. For concerning the standby current, user can
use data register or IO control register to fit the application.
. IO File Register
PAC[012H]: Port A IO control register [R/W], default value [1111]
Register
Bit Name
Read/Write
Bit3
Bit2
PAC2
R/W
Bit1
PAC1
R/W
Bit0
PAC0
R/W
-
-
PAC2~PAC0: Port A IO control data.
PA[013H]: Port A output data register [R/W], default value [1111]
Register
Bit Name
Read/Write
Bit3
Bit2
PA2
R/W
Bit1
PA1
R/W
Bit0
PA0
R/W
-
-
PA2~PA0: Port A output data.
PBC[014H]: Port B IO control register [R/W], default value [1111]
Register
Bit Name
Read/Write
Bit3
PBC3
R/W
Bit2
PBC2
R/W
Bit1
PBC1
R/W
Bit0
PBC0
R/W
PBC3~PBC0: Port B IO control data.
PB[015H]: Port B output data register [R/W], default value [1111]
Register
Bit Name
Read/Write
Bit3
PB3
R/W
Bit2
PB2
R/W
Bit1
PB1
R/W
Bit0
PB0
R/W
PB3~PB0: Port B output data.
2015/05/25
Page 65 of 81
Ver: 1.1
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