TMP86CS44UG datasheet(59/172 Pages) TOSHIBA

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Page 49

TMP86CS44UG

5.2 Port P1 (P17 to P10)

Port P1 is an 8-bit input/output port which can be configured as an input or an output in one-bit unit under software

control. Input/output mode is specified by the corresponding bit in the port P1 input/output control register (P1CR).

Port P1 is configured as an input if its corresponding P1CR bit is cleared to “0”, and as an output if its corresponding

P1CR bit is set to “1”.

During reset, the P1CR is initialized to “0” and port P1 is input mode. The P1 output latches are also initialized to

“0”.

Port P1 is also used as an external interrupt input, a timer/counter input/output, and a divider output. When used as

an input port, an external interrupt input or a timer/counter input, the corresponding bit of P1CR is cleared to “0”.

When used as an output port, a timer/counter output or divider output, the corresponding bit of P1CR is set to “1”

and beforehand the corresponding output latch should be set to “1”. Data can be written into the output latch regard-

less of P1CR contents, therefore initial output data should be written into the output latch before setting P1CR.

Figure 5-3 Port P1

Note: Ports set to the input mode read the pin states. Ports set to the output mode read the output latch. When input pin and out-

put pin exist in port P1 together, the contents of the output latch which is specified as an input mode may be rewritten by

executing the bit manipulation instructions.

P1DR

(0001H)

R/W

543

P17

P16

TC2

P15

INT3

P14

PPG

P13

DVO

P12

INT2

TC1

P11

INT1

P10

PWM3

PDO3

TC3

(Initial value: 0000 0000)

P1CR

(000DH)

543

(Initial value: 0000 0000)

P1CR

I/O port for P1 port

(specified for each bit)

0: Input mode

1: Output mode

R/W

Output latch

P1CRi input

Data output

Output latch

P1CRi

Control output

STOP

OUTEN

Data input

Control input

P1i

Note:i=7 to 0

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