TMP86FS28DFG datasheet(71/272 Pages) TOSHIBA

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Page 59

TMP86FS28DFG

5.4 Port P3 (P30 to P37)

Port P3 is an 8-bit input/output port that can also be used for external interrupt input, divider output, timer/counter

input, serial interface input/output, or UART input/output.

A reset initializes the output latch (P3DR) to “1” and the Pch control (P3OUTCR) to “0”.

To use a pin in Port P3 as an external interrupt input, timer/counter input, serial interface input, or UART input, set

P3DR to “1” and then set the corresponding bit in P3OUTCR to “0”.

To use a pin in Port P3 as a divider output, serial interface output, or UART output, set P3DR to “1”.

Port 3 can be used for either SIO or UART, so be sure not to enable both of these functions at the same time.

The output circuit of Port P3 can be set either as sink open-drain output (“0”) or CMOS output (“1”) individually

for each bit in P3OUTCR.

Port P3 has a separate data input register. The output latch state can be read from the P3DR register, and the pin

state can be read from the P3PRD register.

Figure 5-5 Port P3

Table 5-6 Register Programming for Port P3 (P30 to P37)

Function

Programmed Value

P3DR

P3OUTCR

Port input, external interrupt input, timer/counter

input, serial interface input, UART input

“1”

“0”

Port “0” output

“0”

Set as

appropriate.

Port “1” output, serial interface output, UART

output, divider output

“1”

Data input (P3PRD)

Output latch read (P3DR)

STOP

OUTEN

P3OUTCRi input

Data output (P3DR)

P3OUTCRi

P3i

Note) i = 7~0

Control output

Control input

Output latch

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