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INPUT/OUTPUT PINS

7906 Group User’s Manual Rev.2.0

5-6

Enable D-A output

P73/AN3/DA0

P74/AN4/DA1/INT3/RTPTRG0

P10/CTS0/R TS0

P11/CTS0/CLK0

P14/CTS1/R TS1

P15/CTS1/CLK1

P6OUTCUT/INT4

Port latch

Direction register

Data bus

Output (internal peripheral device)

Analog input

Analog output

[Inside dotted-line included]

[Inside dotted-line not included]

Fig. 5.2.5 Port peripheral circuits (2)

5.2 Programmable I/O ports

5.2.3 Pin P6OUTCUT/INT4 (Port-P6-output-cutoff signal input pin)

Any of bits 0 through 5 of the port P6 direction register (address 1016) are forcibly cleared to “0” by input

of a falling edge to pin P6OUTCUT/INT4, regardless of the mode of port pins P60 through P65; therefore, port

pins P60 through P65 enter the input mode. After that, if it is necessary to output data from port pins P60

through P65, be sure to do as follows:

➀ Return the input level at pin P6OUTCUT/INT4 to “H” level.

➁ Write data to the port P6 register (address E16)’s bits, corresponding to the port P6 pins which will output

data.

➂ Set the port P6 direction register’s bits, corresponding to the port P6 pins in ➁, to “1” in order to set

these port pins to the output mode.

When input level at pin P6OUTCUT/INT4 is “L”, no bit of the port P6 direction register can be set to “1.”

When using port pins P60 through P65 as output port pins at all the time, connect pin P6OUTCUT/INT4 to

Vcc via a resistor. Pin P6OUTCUT/INT4 cannot serve as pin INT4.

Also, when using pin P6OUTCUT/INT4 as an input pin of an external interrupt (pin INT4), use port pins P60

through P65 in the input mode.

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