TMP86CS25AFG datasheet(68/194 Pages) TOSHIBA

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Page 58

5. I/O Ports

5.5 Port P6 (P67 to P60)

TMP86CS25AFG

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 (P6CR), the P6 output latch (P6DR), and ADCCR1<AINDS>. During reset,

P6CR and P6DR are initialized to “0” and ADCCR1<AINDS> is set to “1”. At the same time, the input data of pins

P67 to P60 are fixed to “0”. To use port P6 as an input port, external interrupt input, timer/counter input or key on

wake up input, set data of P6DR to “1” and P6CR to “0”. To use it as an output port, set data of P6CR to “1”. To use

it as an analog input, set data of P6DR to “0” and P6CR to “0”, and start the AD. It is the penetration electric current

measures by the analog voltage.

Pins not used for analog input can be used as I/O ports. During AD conversion, output instructions should not be

executed to keep a precision. In addition, a variable signal should not be input to a port adjacent to the analog input

during AD conversion.

When the AD converter is in use (P6DR = 0), bits mentioned above are read as “0” by executing input instructions.

Figure 5-6 Port 6

Note 1: Do not set output mode to pin which is used for an analog input.

Note 2: When used as an INT0, ECNT and ECIN pins of a secondary function, the respective bit of P6CR should be set to “0” and

the P6 should set to “1”.

Note 3: When used as an STOP2 to STOP5 pins of Key on Wake up, the respective bit of P6CR should be set to “0”.

Note 4: When a read instruction for port P6 is executed, the bit of Analog input mode becomes read data “0”.

Note 5: Although P6DR is a read/writer register, because it is also used as an input mode control function, read-modify-write

instructions such as bit manipulate instructions cannot be used.

Read-modify-write instruction writes the all data of 8-bit after data is read and modified. Because a bit setting Input mode

read data of terminal, the output latch is changed by these instruction. So P6 port can not input data.

P6DR

(0006H)

R/W

543

P67

AIN7

STOP5

P66

AIN6

STOP4

P65

AIN5

STOP3

P64

AIN4

STOP2

P63

AIN3

INT0

P62

AIN2

ECNT

P61

AIN1

ECIN

P60

AIN0

(Initial value: 0000 0000)

543

P6CR

(000CH)

(Initial value: 0000 0000)

P6CR

I/O control for port P6

(specified for each bit)

AINDS = 1 (AD unused)

AINDS = 0 (AD used)

R/W

P6DR = “0”

P6DR = “1”

P6DR = “0”

P6DR = “1”

Input “0” fixed

Input mode

AD input

Input mode

Output mode

Data input (P6DR)

Analog input

Data output (P6DR)

AINDS

SAIN

P6CRi

P6CRi input

P6i

Note 1: i = 7 to 0, j = 7 to 4

Note 2: STOP is bit7 in SYSCR1

Note 3: SAIN is bit 0 to 3 in ADCCRA

Note 4: STOPj is bit 4 to 7 is STOPCR.

STOPj

STOP

Key on Wake up

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