TMP88CU74F datasheet(45/132 Pages) TOSHIBA

45 / 132 page

TMP88CU74

2003-02-17

88CU74-45

2.2.4

Port P3 (P32 to P30)

Port P3 is an 3-bit input/output port and serial interface (SIO1) input/output.

Input/output mode is specified by the port P3 input/output control register (P3CR).

During reset P3CR is initialized to “0” and Port P3 is input mode. The port P3 output

latches are initialized to “0”.

P3 is serial bus interface input/output.

When used as function pins set to output mode by Port P3 I/O control register, and I/O is

controlling by output data.

The output buffer can be change to the tri-state or shink-open drain by Port P3 I/O

control register (P3CR).

When a read instruction for port P3 is executed, bits 7 to 3 in P3 read is an undefined

data.

Note:

Input mode port reads the state of input pin. When input/output mode is used to mixed,

the contents of output latch setting to the input mode may be overwritten by executing bit

manipulation instructions.

P30

SCK

(00003H)

P32

SCL

SI0

P31

SDA

SO0

(Initial value:

**** *000)

P3CR

(0002BH)

P3O

DR2

P3O

DR1

P3O

DR0

P3CR

(Initial value:

**00 0000)

P3CR

I/O control of port P3

(Setting per bit)

0: Input mode

1: Output mode

P3ODR0

P30 tri-state/open-drain control

P3ODR1

P31 tri-state/open-drain control

P3ODR2

P32 tri-state/open-drain control

0: Tri-state

1: Open-drain

Write

only

Figure 2.2.5 P3 and Port P3 I/O Control Register

D Q

P3CRi

Data input

Data output

Output control

Input control

Output latch

P3i

P3ODRi

Note 1:

*: Don’t care

Note 2: i = 2 to 0

2007-10-19

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