NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
PTxDDn
Output enable
D
Q
PTxDn
Output data
D
Q
1
0
Port read
data
SYNCHRONIZER
Input data
BUSCLKS
aaa-028001
Figure 13.ꢀGeneral purpose I/O block diagram
ꢁ
KBEDEy
KBIPEy
PTxPEn
PTA[3:0]
only
VDD
RPU
PTxDDn
Write
PTxDn
Port pin
Read
PTxDn
KBEDGy
PTA[3:0]
only
KBIPEy
PTxPEn
KBI interrupt
RPD
KBACK
KBMOD
aaa-028002
Figure 14.ꢀGeneral purpose I/O logic
Table 54.ꢀTruth table for pullup and pulldown resistors
PTAPE[3:0]
(pull enable)
PTADD[3:0]
KBIPE[3:0]
KBEDG[3:0]
Pullup
Pulldown
(data direction)
(KBI pin enable)
(KBI Edge Select)
0
1
x
1
1
0
0
1
0
0
x
0
x
1
1
x
x
x
0
1
disabled
enabled
disabled
enabled
disabled
disabled
disabled
disabled
disabled
enabled
FXTH87ERM
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Reference manual
Rev. 5.0 — 4 February 2019
53 / 183
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