Datasheet

Section 8 I/O Ports
Rev.7.00 Feb. 14, 2007 page 256 of 1108
REJ09B0089-0700
Port A MOS Pull-Up Control Register (PAPCR)
Bit : 7 6 5 4 3 2 1 0
— — — — PA3PCR PA2PCR PA1PCR PA0PCR
Initial value : Undefined Undefined Undefined Undefined 0 0 0 0
R/W : — — — — R/W R/W R/W R/W
PAPCR is an 8-bit readable/writable register that controls the MOS input pull-up function
incorporated into port A on an individual bit basis.
Bits 7 to 4 are reserved; they return an undetermined value if read, and cannot be modified.
Bits 3 to 0 are valid in modes 6 and 7
*
, and all the bits are invalid in modes 4 and 5. When
PADDR bits are cleared to 0 (input port setting), setting the corresponding PAPCR bits to 1 turns
on the MOS input pull-up for the corresponding pins.
PAPCR is initialized to H'0 (bits 3 to 0) by a reset, and in hardware standby mode. It retains its
prior state in software standby mode.
Note: * Modes 6 and 7 are not available in the ROMless versions.
Port A Open Drain Control Register (PAODR)
Bit : 7 6 5 4 3 2 1 0
— — — — PA3ODR PA2ODR PA1ODR PA0ODR
Initial value : Undefined Undefined Undefined Undefined 0 0 0 0
R/W : — — — — R/W R/W R/W R/W
PAODR is an 8-bit readable/writable register that controls whether PMOS is on or off for each
port A pin (PA3 to PA0).
Bits 7 to 4 are reserved; they return an undetermined value if read, and cannot be modified.
All bits are valid in mode 7.
*
Setting PAODR bits to 1 makes the corresponding port A pins NMOS open-drain outputs, while
clearing the bits to 0 makes the pins CMOS outputs.
PAODR is initialized to H'0 (bits 3 to 0) by a reset, and in hardware standby mode. It retains its
prior state in software standby mode.
Note: * Modes 6 and 7 are not available in the ROMless versions.