TMP86FS23UG datasheet(67/252 Pages) TOSHIBA

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Page 55

TMP86FS23UG

5.3 Port P3 (P37 to P30)

Port P3 is a 3-bit output and a 5-bit input/output port.

It is also used as a timer/counter input/output, serial interface input/output or divider output.

When used as a timer/counter output, serial interface output or divider output, respective output latch (P3DR)

should be set to “1”.

It can be selected whether output circuit of P30 to P34 port is C-MOS output or a sink open drain individually, by

setting P3OUTCR. When a corresponding bit of P3OUTCR is “0”, the output circuit is selected to a sink open drain

and when a corresponding bit of P3OUTCR is “1”, the output circuit is selected to a C-MOS output. When used as

an input port, serial interface input or timer/counter input, respective output control (P3OUTCR) should be set to “0”

after P3DR is set to “1”. During reset, the P3DR is initialized to “1”, and the P3OUTCR is initialized to “0”.

P3 port output latch (P3DR) and P3 port terminal input (P3PRD) are located on their respective address.

When read the output latch data, the P3DR should be read and when read the terminal input data, the P3PRD reg-

ister should be read. If a read instruction is executed for the P3PRD and the P3OUTCR, read data of bits 7 to 5 are

unstable.

Figure 5-4 Port P3

Table 5-3 Register Programming for Multi-function ports (P34 to P30)

Function

Programmed Value

P3DR

P3OUTCR

Port input, serial interface input,

or timer counter input

“1”

“0”

Port “0” output

“0”

Programming

for each

applications

Port “1” output, serial interface output,

or timer counter output

“1”

Table 5-4 Register Programming for Multi-function (P37 to P35)

Function

Programmed

Value

P3DR

Port “0” output

“0”

Port “1” output, timer counter output, or divider output

“1”

Output latch

Data input (P3PRD)

Output latch read (P3DR)

Output latch read (P3DRj)

Control input

STOP

OUTEN

STOP

OUTEN

P3OUTCRi input

Control output

Data output (P3DR)

P3OUTCRi

P3i

Note: i = 4

to 0

Output latch

Data output (P3DRj)

P3j

Note: j = 7

to 5

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