TMP86FS23UG datasheet(71/252 Pages) TOSHIBA

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Page 59

TMP86FS23UG

5.5 Port P6 (P67 to P60)

Port P6 is an 8-bit input/output port which can be configured as an input or an output in one-bit unit. Port P6 is also

used as an analog input, Key on Wake up input, timer/counter input and external interrupt input. Input/output mode

is specified by the P6 control register (P6CR1) and input control register (P6CR2).

When used as an output port, the corresponding bit of P6CR1 should be set to “1”.

When used as an input port, timer/counter input or an external interrupt input, the corresponding bit of P6CR1

should be cleared to “0”, and then, the corresponding bit of P6CR2 should be set to “1”.

When used as an analog input or key on wake up input, the corresponding bit of P6CR1 should be cleared to “0”,

and then, the corresponding bit of P6CR2 should be cleared to “0” .

The output latch of each digital input port with multiple functions should be set to “0” to prevent flow-through cur-

rent. Therefore, the output latch of each port to be used for analog input should be preprogrammed to “0”. The con-

version input channel to be used is actually selected by ADCCR1<SAIN>.

During reset, the output latch (P6DR) and P6CR1 are initialized to 0“, P6CR2 is initialized to “1”.

When the bit of P6CR1 and P6CR2 is “0”, the corresponding bit data by read instruction is always “0”.

When the bit of P6CR1 is “0” and that of P6CR2 is “1”, the corresponding bit data by read instruction is a terminal

input data.

When the bit of P6CR1 is “1”, the corresponding bit data by read instruction is the value of P6DR.

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

Table 5-7 Register Programming for Multi-function Ports

Function

Programmed Value

P6DR

P6CR1

P6CR2

Port input external interrupt input or timer counter input

“0”

“1”

Analog input or key-on wake-up input

“0”

Port “0” output

“0”

“1”

Port “1” output

“1”

Table 5-8 Values Read from P6DR and Register Programming

Conditions

Values Read from P6DR

P6CR1

P6CR2

“0”

“1”

Terminal input data

“1”

“0”

Output latch contents

“1”

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