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Section 8 I/O Ports
(4)
Pin Functions
The relationship between the register settings and the pin function is shown below.
(a)
Extended Mode (EXPE = 1)
The pin function is switched as shown below according to the P1nDDR bit.
P1nDDR
ADMXE
0
ABW,
X
ABW256
Pin
P1n input
function
pin
[Legend] n = 7 to 0, X: Don't care.
(b)
Single-Chip Mode (EXPE = 0)
The pin function is switched as shown below according to the P1nDDR bit.
P1nDDR
Pin function
[Legend] n = 7 to 0
(5)
Port 1 Input Pull-Up MOS
Port 1 has built-in input pull-up MOSs that can be controlled by software. The input pull-up MOS
can be used regardless of the operating mode. Table 8.2 summarizes the input pull-up MOS states.
Table 8.2
Port 1 Input Pull-Up MOS States
Hardware Standby
Mode
Reset
Off
Off
[Legend]
Off:
Always off.
On/Off: On when P1DDR = 0 and P1PCR = 1; otherwise off.
Rev. 1.00 Mar. 12, 2008 Page 194 of 1178
REJ09B0403-0100
0
1
Either bit is 0
Both bits
(8/16-bit bus)
are 1 (8-bit
bus)
ADn
P1n input
input/output
pin
pin
0
P1n input pin
Software Standby
Mode
On/Off
1
0
X
Either bit is 0
(8/16-bit
bus)
An output
Setting
pin
prohibited
P1n output pin
In Other Operations
On/Off
1
Both bits
are 1 (8-bit
bus)
P1n output
pin
1
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