Nxp Semiconductors UM10237 ユーザーズマニュアル

UM10237_2

User manual

Rev. 02 — 19 December 2008

204 of 792

NXP Semiconductors

UM10237

Chapter 10: LPC24XX General Purpose Input/Output (GPIO)

6.5 Fast GPIO port Mask register FIOMASK(FIO[0/1/2/3/4]MASK -

0x3FFF C0[1/3/5/7/9]0)

This register is available in the enhanced group of registers only. It is used to select port
pins that will and will not be affected by write accesses to the FIOPIN, FIOSET or FIOCLR
register. Mask register also filters out port’s content when the FIOPIN register is read.

A zero in this register’s bit enables an access to the corresponding physical pin via a read
or write access. If a bit in this register is one, corresponding pin will not be changed with
write access and if read, will not be reflected in the updated FIOPIN register. For software
examples, see

Section 10–7 “GPIO usage notes” on page 208

Table 172. Fast GPIO port Pin value byte and half-word accessible register description

Generic
Register
name

Description

Reset
value

PORTn Register
Address & Name

FIOxPIN0

Fast GPIO Port x Pin value
register 0. Bit 0 in FIOxPIN0
register corresponds to pin
Px.0 ... bit 7 to pin Px.7.

8 (byte)
R/W

0x00

FIO0PIN0 - 0x3FFF C014
FIO1PIN0 - 0x3FFF C034
FIO2PIN0 - 0x3FFF C054
FIO3PIN0 - 0x3FFF C074
FIO4PIN0 - 0x3FFF C094

FIOxPIN1

Fast GPIO Port x Pin value
register 1. Bit 0 in FIOxPIN1
register corresponds to pin
Px.8 ... bit 7 to pin Px.15.

8 (byte)
R/W

0x00

FIO0PIN1 - 0x3FFF C015
FIO1PIN1 - 0x3FFF C035
FIO2PIN1 - 0x3FFF C055
FIO3PIN1 - 0x3FFF C075
FIO4PIN1 - 0x3FFF C095

FIOxPIN2

Fast GPIO Port x Pin value
register 2. Bit 0 in FIOxPIN2
register corresponds to pin
Px.16 ... bit 7 to pin Px.23.

8 (byte)
R/W

0x00

FIO0PIN2 - 0x3FFF C016
FIO1PIN2 - 0x3FFF C036
FIO2PIN2 - 0x3FFF C056
FIO3PIN2 - 0x3FFF C076
FIO4PIN2 - 0x3FFF C096

FIOxPIN3

Fast GPIO Port x Pin value
register 3. Bit 0 in FIOxPIN3
register corresponds to pin
Px.24 ... bit 7 to pin Px.31.

8 (byte)
R/W

0x00

FIO0PIN3 - 0x3FFF C017
FIO1PIN3 - 0x3FFF C037
FIO2PIN3 - 0x3FFF C057
FIO3PIN3 - 0x3FFF C077
FIO4PIN3 - 0x3FFF C097

FIOxPINL

Fast GPIO Port x Pin value
Lower half-word register. Bit 0
in FIOxPINL register
corresponds to pin Px.0 ... bit
15 to pin Px.15.

16 (half-word)
R/W

0x0000 FIO0PINL - 0x3FFF C014

FIO1PINL - 0x3FFF C034
FIO2PINL - 0x3FFF C054
FIO3PINL - 0x3FFF C074
FIO4PINL - 0x3FFF C094

FIOxPINU

Fast GPIO Port x Pin value
Upper half-word register. Bit 0
in FIOxPINU register
corresponds to pin Px.16 ... bit
15 to Px.31.

16 (half-word)
R/W

0x0000 FIO0PINU - 0x3FFF C016

FIO1PINU - 0x3FFF C036
FIO2PINU - 0x3FFF C056
FIO3PINU - 0x3FFF C076
FIO4PINU - 0x3FFF C096