TMP86CS49FG datasheet(70/252 Pages) TOSHIBA

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Page 56

5. I/O Ports

5.5 Port P4 (P47 to P40)

TMP86CS49FG

5.5 Port P4 (P47 to P40)

Port P4 is an 8-bit input/output port.

Port P4 is also used as a serial interface input/output and an UART input/output.

When used as an input port, a serial interface input/output and an UART input/output, the corresponding output

latch (P4DR) should be set to "1".

During reset, the P4DR is initialized to "1", and the P4OUTCR is initialized to "0".

It can be selected whether output circuit of P4 port is a C-MOS output or a sink open drain individually, by setting

P4OUTCR. When a corresponding bit of P4OUTCR is "0". the output circuit is selected to a sink open drain and

when a corresponding bit of P4OUTCR is "1", the output circuit is selected to a C-MOS output.

When used as an input port, a serial interface input and an UART input, the corresponding output control

(P4OUTCR) should be set to "0" after P4DR is set to "1".

P4 port output latch (P4DR) and P4 port terminal input (P4PRD) are located on their respective address.

When read the output latch data, the P4DR should be read. When read the terminal input data, the P4PRD register

should be read.

Note: i = 7 to 0

Figure 5-6 Port 4

Table 5-3 Register Programming for Multi-function Ports (P47 to P40)

Function

Programmed Value

P4DR

P4OUTCR

Port input UART input or serial interface input

“1”

“0”

Port “0” output

“0”

Programming

for each applica-

tions

Port “1” output UART output or serial interface

output

“1”

Data output (P4DR)

Control output

STOP

OUTEN

P4OUTCRi

P4i

P4OUTCRi input

Data input (P4PRD)

Output latch read (P4DR)

Control input

Output latch

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