LPC810M021FN8 datasheet(78/313 Pages) NXP

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UM10601

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Preliminary user manual

Rev. 1.0 — 7 November 2012

78 of 313

NXP Semiconductors

UM10601

Chapter 7: LPC800 GPIO port

7.6.3 GPIO port direction registers

Each GPIO port has one direction register for configuring the port pins as inputs or

outputs.

7.6.4 GPIO port mask registers

These registers affect writing and reading the MPORT registers. Zeroes in these registers

enable reading and writing; ones disable writing and result in zeros in corresponding

positions when reading.

7.6.5 GPIO port pin registers

Reading these registers returns the current state of the pins read, regardless of direction,

masking, or alternate functions, except that pins configured as analog I/O always read as

0s. Writing these registers loads the output bits of the pins written to, regardless of the

Mask register.

Table 70.

GPIO port 0 word pin registers (W[0:17], addresses 0xA000 1000 (W0) to 0x5000

1048 (W17)) bit description

Bit

Symbol

Description

Reset

value

Access

31:0

PWORD Read 0: pin is LOW.

Write 0: clear output bit.

Read 0xFFFF FFFF: pin is HIGH.

Write any value 0x0000 0001 to 0xFFFF FFFF: set output

bit.

Remark:

Only 0 or 0xFFFF FFFF can be read. Writing any

value other than 0 will set the output bit.

ext

R/W

Table 71.

GPIO direction port 0 register (DIR0, address 0xA000 2000) bit description

Bit

Symbol

Description

Reset

value

Access

17:0

DIRP0

Selects pin direction for pin PIO0_n (bit 0 = PIO0_0, bit 1 =

PIO0_1, ..., bit 17 = PIO0_17).

0 = input.

1 = output.

0R/W

31:18 -

Reserved.

Table 72.

GPIO mask port 0 register (MASK0, address 0xA000 2080) bit description

Bit

Symbol

Description

Reset

value

Access

17:0

MASKP0 Controls which bits corresponding to PIO0_n are active in the

P0MPORT register (bit 0 = PIO0_0, bit 1 = PIO0_1, ..., bit 17

= PIO0_17).

0 = Read MPORT: pin state; write MPORT: load output bit.

1 = Read MPORT: 0; write MPORT: output bit not affected.

0R/W

31:18 -

Reserved.

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