TMP93CS32F datasheet(53/180 Pages) TOSHIBA

53 / 180 page

TMP93CS32

2004-02-10

93CS32-51

Port 3 Register

Bit symbol

P35

−

P32

P31

P30

Read/Write

R/W

After reset

−

(0007H)

Function

Input mode

(Note) Always write “1”

(This bit is read as “1”).

Input mode

Output mode

Note: 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

−

P32C

Read/Write

After reset

−

P3CR

(000AH)

Function

0: Input

1: Output

(Note) Always write “1”

(This bit is read as “1”).

0: Input

1: Output

I/O setting

Input

Output

Note: Read-modify-write instruction is prohibited for P3CR.

Port 3 Function Register

Bit symbol

−

P32F

P31F

P30F

Read/Write

After reset

−

P3FC

(000BH)

Function

(Note)

Always write

“0” (This bit is

read as “1”).

(Note) Always write “0”

(This bit is read as “1”).

0: Port

1: HWR

0: Port

1: WR

0: Port

1: RD

Note: Read-modify-write instruction is prohibited for P3FC.

Figure 3.5.9 Registers for Port 3

P32 ( HWR ) function setting

<P32>

<P32F>

“0” output

“1” output

HWR

output only for external access

P30 ( 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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