Datasheet

Section 9 I/O Ports
Rev.6.00 Mar. 18, 2009 Page 370 of 980
REJ09B0050-0600
Bit Bit Name Initial Value R/W Description
1 A17E 1 R/W Address 17 Enable
Enables or disables output for address output 17
(A17).
0: DR output when PA1DDR = 1
1: A17 output when PA1DDR = 1
0 A16E 1 R/W Address 16 Enable
Enables or disables output for address output 16
(A16).
0: DR output when PA0DDR = 1
1: A16 output when PA0DDR = 1
9.8.8 Pin Functions
Port A pins also function as the pins for address outputs and interrupt inputs. The correspondence
between the register specification and the pin functions is shown below.
• PA7/A23/CS7/IRQ7
The pin function is switched as shown below according to the operating mode, bit EXPE, bits
A23E and CS7E, bits ITS7 to ITS5 in ITSR, and bit PA7DDR.
Operating
mode
1, 2, 4 7
EXPE — 0 1
A23E 0 1 — 0 1
CS7E 0 1 — — 0 1 —
PA7DDR 0 1 0 1 0 1 0 1 0 1 0 1
PA7
input
PA7
output
PA7
input
CS7
output
PA7
output
Address
output
PA7
input
PA7
output
PA7
input
PA7
output
PA7
input
CS7
output
PA7
input
Address
output
Pin function
IRQ7 interrupt input
*
Note: * IRQ7 input when ITS7 = 0.