Datasheet

Section 8 I/O Ports
Rev. 3.00 Sep. 28, 2009 Page 136 of 710
REJ09B0384-0300
P3n input
1 expected
P3nDR
0 expected
P3nDR
(n = 7 to 0)
Figure 8.2 Noise Canceler Operation
8.3.7 Pin Functions
The pin function is switched as shown below according to the combination of the PnDDR bit and
the P3nNCE bit.
P3nDDR 0 1
P3nNCE 0 1 x
Pin function ExDBn input pin P3n input pin P3n output pin
[Legend]
n = 7 to 0
x: Don't care
8.3.8 Port 3 Input Pull-Up MOS
Port 3 has a built-in input pull-up MOS that can be controlled by software. This input pull-up
MOS can be used in single-chip mode. Table 8.4 summarizes the input pull-up MOS states.
Table 8.4 Port 3 Input Pull-Up MOS States
Reset
Hardware Standby
Mode
Software Standby
Mode
In Other Operations
Off Off On/Off On/Off
[Legend]
Off: Always off.
On/Off: On when input state and P3PCR = 1; otherwise off.