NXP Semiconductors
UM11227
NTM88 family of tire pressure monitor sensors
UM11227 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved.
User manual Rev. 6 — 24 April 2020
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QD
1
0
Port read
data
PTxDn
QD
PTxDDn
Output enable
Output data
Input data
aaa-028001
SYNCHRONIZER
BUSCLKS
Figure 13. General purpose I/O block diagram
Reading and writing of general purpose I/O is performed through the port data registers
PTxDn. The direction, either read of input or write of output, is controlled through the port
data direction registers PTxDDn. When configured as input, the pull-up or pull-downs are
controlled through a combination of port pull enable registers PTxPEn and the PTxDDn
registers. Where x refers to the port A or B, and n refers to the port pin 0, 1, etc.
aaa-037306
Port pin
VDD
KBEDGy
KBIPEy
PTxPEn
KBEDGy
KBIPEy
KBACK KBMOD
KBI interrupt
PTxPEn
PTxDDn
PTxDn
Write
Read
PTxDn
RPU
RPD
PTA[3:0]
only
PTA[3:0]
only
Figure 14. General purpose I/O logic
Port A [3:0] GPIOs support a keyboard interrupt peripheral function. Each keyboard
interrupt pin can be programmed for edge or level or both sensitivity. The sensitivities can
be programmed for falling edge / low level or rising edge / high level while in run mode,
and falling edge / low level while in stop modes.
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