TMP86FS28DFG datasheet(67/272 Pages) TOSHIBA

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Page 55

TMP86FS28DFG

5.2 Port P1 (P10 to P17)

Port P1 is an 8-bit input/output port that can be configured as an input or an output on a bit basis. Port P1 is also

used for analog input or key-on wake-up input.

The Port P1 input/output control register (P1CR1) and Port P1 input control register (P1CR2) are used to specify

the function of each pin.

A reset initializes P1CR1 to “0”, P1CR2 to “1”, and the output latch (P1DR) to “0” so that Port P1 becomes an

input port.

To use a pin in Port P1 as an input port, set P1CR1 to “0” and then set P1CR2 to “1”. To use a pin in Port P1 as an

analog input or key-on wake-up input, set P1CR1 to “0” and then set P1CR2 to “0”.

To use a pin in Port P1 as an output port, set the corresponding bit in P1CR1 to “1”.

To read the output latch data, set P1CR1 to “1”and read P1DR. To read the pin state, set P1CR1 to “0” and P1CR2

to “1” and then read P1DR. When P1CR1 = “0” and P1CR2 = “0”, P1DR is read as “0”.

Bits not used as analog inputs are used as input/output pins. During AD conversion, however, output instructions

must not be executed to ensure the accuracy of conversion results. Also, during AD conversion, do not input signals

that fluctuate widely to pins near analog input pins.

Note: An asterisk (*) indicates that either “1” or “0” can be set.

Table 5-4 Register Programming for Port P1 (P10 to P17)

Function

Programmed Value

P1DR

P1CR1

P1CR2

Port input

“0”

“1”

Analog input, key-on wake-up input

“0”

Port “0” output

“0”

“1”

Port "1" output

“1”

Table 5-5 Values Read from P1DR according to Register Programming

Conditions

Values Read from P1DR

P1CR1

P1CR2

“0”

“1”

Pin state

“1”

“0”

Output latch state

“1”

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