C8051F310 datasheet(142/228 Pages) SILABS

142 / 228 page

C8051F310/1/2/3/4/5/6/7

142

Rev. 1.7

SFR Definition 13.15. P3: Port3

SFR Definition 13.16. P3MDIN: Port3 Input Mode

Bits7–0: P3.[7:0]

Write - Output appears on I/O pins.

0: Logic Low Output.

1: Logic High Output (high impedance if corresponding P3MDOUT.n bit = 0).

Read - Always reads ‘1’ if selected as analog input in register P3MDIN. Directly reads Port

pin when configured as digital input.

0: P3.n pin is logic low.

1: P3.n pin is logic high.

Note:

Only P3.0–P3.4 are associated with Port pins on C8051F310/2/4 devices; Only P3.0 is associated with a

Port pin on C8051F311/3/5/6/7 devices.

R/W

Reset Value

P3.7

P3.6

P3.5

P3.4

P3.3

P3.2

P3.1

P3.0

11111111

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

SFR Address:

(bit addressable)

0xB0

Bits7–5: UNUSED. Read = 000b; Write = don’t care.

Bits4–0: Input Configuration Bits for P3.4–P3.0 (respectively).

Port pins configured as analog inputs have their weak pullup, digital driver, and digital

receiver disabled.

0: Corresponding P3.n pin is configured as an analog input.

1: Corresponding P3.n pin is not configured as an analog input.

Note:

Only P3.0–P3.4 are associated with Port pins on C8051F310/2/4 devices; Only P3.0 is associated with a

Port pin on C8051F311/3/5/6/7 devices.

R/W

Reset Value

11111111

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

SFR Address:

0xF4

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