TMP86FS23UG datasheet(74/252 Pages) TOSHIBA

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Page 62

5. I/O Ports

5.6 Port P7 (P77 to P70)

TMP86FS23UG

5.6 Port P7 (P77 to P70)

Port P7 is an 8-bit input/output port which can be configured as an input or an output in one-bit unit. Port P7 is also

used as a segment output of LCD. Input/output mode is specified by the P7 control register (P7CR).

When used as an input port, the corresponding bit of P7CR and P7LCR should be cleared to “0”.

When used as an output port, the corresponding bit of P7CR should be set to “1”, and the respective P7LCR bit

should be cleared to “0”.

When used as a segment pins of LCD, the respective bit of P7LCR should be set to “1”.

During reset, the output latch (P7DR), P7CR and P7LCR are initialized to “0”.

When the bit of P7CR and P7LCR is “0”, the corresponding bit data by read instruction is a terminal input data.

When the bit of P7CR is “0” and that of P7LCR is “1”, the corresponding bit data by read instruction is always

“0“.

When the bit of P7CR is “1”, the corresponding bit data by read instruction is the value of P7DR.

Note: Asterisk (*) indicates “1” or “0” either of which can be selected.

Figure 5-7 Port P7

Table 5-9 Register Programming for Multi-function Ports

Function

Programmed Value

P7DR

P7CR

P7LCR

Port input

“0”

Port “0” output

“0”

“1”

“0”

Port “1” output

“1”

“0”

LCD segment output

“1”

Table 5-10 Values Read from P7DR and Register Programming

Conditions

Values Read from P7DR

P7CR

P7LCR

“0”

Terminal input data

“0”

“1”

“0”

“1”

“0”

Output latch contents

“1”

P7LCRi

Output latch

Data output (P7DRi)

LCD data output

STOP

OUTEN

P7LCRi input

P7CRi

P7CRi input

Data input (P7DRi)

P7i

Note:i=7 to 0

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