NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
FXTH87ERM
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Reference manual
Rev. 5.0 — 4 February 2019
57 / 183
Table 62. Port B data register field descriptions
Field
Description
1:0
PTBD
[1:0]
Port B Data Register Bit n — For port B pins that are inputs, reads return the logic level on the pin. For port
B pins that are configured as outputs, reads return the last value written to this register.
Writes are latched into all bits of this register. For port B pins that are configured as outputs, the logic level
is driven out the corresponding MCU pin.
Reset forces PTBD to all 0s, but these 0s are not driven out the corresponding pins because reset also
configures all port pins as high-impedance inputs with pullups disabled.
Table 63. Internal pullup enable for port B register (PTBPE) (address $0005)
Bit
7
6
5
4
3
2
1
0
R
W
PTBPE[1:0]
Reset
0
0
0
0
0
0
0
0
= Reserved
Table 64. Port B register pullup enable field descriptions
Field
Description
1:0
PTBPE[1:0]
Internal Pullup Enable for Port B Bit n — Each of these control bits determines if the internal pullup device is
enabled for the associated PTB pin. For port B 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 B bit n.
1 Internal pullup device enabled for port B bit n.
Table 65. Data direction for port B register (PTBDD) (address $0007)
Bit
7
6
5
4
3
2
1
0
R
W
PTBDD[1:0]
Reset
0
0
0
0
0
0
0
0
= Reserved
Table 66. Port B data direction field descriptions
Field
Description
1:0
PTBDD[1:0]
Data Direction for Port B Bit n — These read/write bits control the direction of port B pins and what is read
for PTBDD reads.
0 Input (output driver disabled) and reads return the pin value.
1 Output driver enabled for port B bit n and PTBDD reads return the contents of PTBDDn.
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