Datasheet

Section 8 I/O Ports
Rev. 2.00 Aug. 20, 2008 Page 206 of 1198
REJ09B0403-0200
P3n input
1 expected
P3nDR
0 expected
P3nDR
(n = 7 to 0)
Figure 8.2 Noise Canceler Operation
(7) Pin Functions
(a) Normal Extended Mode
Port 3 pins are automatically set to function as bidirectional data bus pins.
(b) Address-Data Multiplex Extended Mode
The operation is the same as that in single-chip mode.
(c) Single-Chip Mode
The pin function is switched as shown below according to the combination of the P3nDDR bit and
the P3nNCE bit.
P3nDDR 0 1
P3nNCE 0 1 X
Pin function P3n input pin ExDBn input P3n output pin
[Legend] n = 7 to 0, X: Don't care.