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(4)
Pin Functions
The relationship between the register settings and the pin function is shown below.
(a)
Extended Mode (EXPE = 1)
• P27 to P24
The pin function is the same as that in single-chip mode.
• P23
The pin function is switched as shown below according to the combination of the CS256E and
IOSE bits in SYSCR, the ADFULLE bit in BCR2 of the BSC, and the P23DDR bit. Address
11 in the table below is expressed by the following logical expression.
Address 11 = 1: ADFULLE • CS256E • IOSE
P23DDR
ADMXE
Address 11
Pin
P23 input
function
pin
• P22 to P20
P2nDDR
ADMXE
Pin
P2n input pin
function
[Legend]
m = 10 to 8, n = 2 to 0, X: Don't care.
0
0
1
X
X
AD11
input/output pin
0
0
ADm input/output
0
0
A11 output
pin
1
Am output pin
pin
Rev. 1.00 Mar. 12, 2008 Page 197 of 1178
Section 8 I/O Ports
1
1
P23 output
AD11
pin
input/output pin
1
0
ADm input/output
pin
REJ09B0403-0100
1
X
1
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