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Section 8 I/O Ports
(4)
Pin Functions
The relationship between the operating mode, register setting values, and pin functions are as
follows.
(a)
Normal Extended Mode
Port A pins can function as address output, interrupt input, event counter input, EtherC control I/O
or I/O port pins, and input or output can be specified in bit units.
Address 18 and address 13 in the following tables are expressed by the following logical
expressions according to the control bits of the bus controller or other module.
Address 18 = 1: ADFULLE
Address 13 = 1: ADFULLE • CS256E • IOSE
• PA7/ExIRQ7/EVENT7/A23/EXOUT
The pin function is switched as shown below according to the setting of address 18 and the
PA7DDR bit.
Setting the ISS7 bit in ISSR makes the pin to function as the ExIRQ7 input pin.
When using the pin as the ExIRQ7 input or an EVENT input pin, clear the PA7DDR bit to 0.
Though the settings for the EVENT input pin have been made, set the PA7DDR bit to 1 when
using the pin as the PA7 or A23 output pin.
When the module stop mode is cleared in both the EtherC and E-DMAC, this pin functions as
the EXOUT output pin.
PA7DDR
Address 18
Pin function
ExIRQ7 input pin/EVENT7 input pin
[Legend] X: Don't care.
Rev. 1.00 Mar. 12, 2008 Page 240 of 1178
REJ09B0403-0100
0
X
PA7 input pin
1
1
PA7 output pin
1
0
A23 output pin
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