TMP93CS44 datasheet(63/224 Pages) TOSHIBA

63 / 224 page

TMP93CS44/S45

2004-02-10

93CS44-61

Port 3 Register

Bit symbol

P35

P34

P33

P32

P31

P30

(0007H)

Read/Write

R/W

After reset

Function

Input mode

(pulled up)

Output mode

Note 1:

When port 32 is used in the input mode, P3 register controls the built-in pull-up resistor. Read-modify-write

is prohibited in the input mode or the I/O mode.

Setting the built-in pull-up resistor may be depended on the states of the input pin.

Port 3 Control Register

Bit symbol

P35C

P34C

P33C

P32C

P3CR

(000AH)

Read/Write

After reset

Function

0: Input

1: Output

Prohibit

read-

modify-

write

Port 3 Function Register

Bit symbol

P32M

P34F

P33F

P32F

P31F

P30F

P3FC

(000BH)

Read/Write

After reset

Function

0: HWR

1: SCK

0: Port

1: SCL/SI

0: Port

1: SDA/SO

0: Port

1: P32M

0: Port

1: WR

0: Port

1: RD

Prohibit

read-

modify-

write

Note 2: When P33 and P34

are used as the serial

bus interface I/O pins

in I

2C bus mode

(P3FC<P34F:P33F>

= 11), set open-drain

outputs

(ODE<ODE34:33>

11).

Figure 3.5.9 Registers for Port 3

I/O setting

Input

Output

P34 function setting (Note 2)

<P34C>

<P34F>

Input port

Output port

Input SI

I/O SCL

P33 function setting (Note 2)

<P33C>

<P33F>

Input port

Output port

Don’t set

I/O SDA/

Output SO

P32 function setting

<P32M>

<P32F>

Port

Output

“ HWR ”

Input/output

“SCK”

P31 ( RD ) function setting

<P30>

<P30F>

“0” output

“1” output

Always RD

output (for

pseudo

SRAM)

output

only for

external

access

P31 ( WR ) function setting

<P31>

<P31F>

“0” output

“1” output

output only for external

access

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