NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
FXTH87ERM
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Reference manual
Rev. 5.0 — 4 February 2019
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= Reserved
Table 58. Port A register pullup enable field descriptions
Field
Description
3:0
PTAPE[3:0]
Internal Pullup Enable for Port A Bit n — Each of these control bits determines if the internal pullup device is
enabled for the associated PTA pin. For port A pins that are configured as outputs, these bits have no effect
and the internal pullup devices are disabled.
0 Internal pullup device disabled for port A bit n.
1 Internal pullup device enabled for port A bit n.
Table 59. Data direction for port A register (PTADD) (address $0003)
Bit
7
6
5
4
3
2
1
0
R
W
PTADD[3:0]
Reset
0
0
0
0
0
0
0
0
= Reserved
Table 60. Port A data direction field descriptions
Field
Description
3:0
PTADD[3:0]
Data Direction for Port A Bit n — These read/write bits control the direction of port A pins and what is read
for PTADD reads.
0 Input (output driver disabled) and reads return the pin value.
1 Output driver enabled for port A bit n and PTADD reads return the contents of PTADDn. PTA4 is input-
only; therefore, bit 4 will always be 0.
8.5 Port B registers
Port B PTB[1:0] functions are multiplexed with the LF receiver block such that the port
B GPIOs become high impedance when the LF block has been enabled. When the LF
block is disabled, port B pins operate as described here.
Table 61. Port B data register (PTBD) (address $0004)
Bit
7
6
5
4
3
2
1
0
R
W
PTBD[1:0]
Reset
0
0
0
0
0
0
0
0
= Reserved
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