NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
FXTH87ERM
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Reference manual
Rev. 5.0 — 4 February 2019
60 / 183
Table 69. KBISC register field descriptions
Field
Description
7:4
Unused register bits, always read 0.
3
KBF
Keyboard Interrupt Flag — KBF indicates when a keyboard interrupt is detected. Writes have no effect on
KBF.
0 No keyboard interrupt detected.
1 Keyboard interrupt detected.
2
KBACK
Keyboard Acknowledge — Writing a 1 to KBACK is part of the flag clearing mechanism. KBACK always
reads as 0.
1
KBIE
Keyboard Interrupt Enable — KBIE determines whether a keyboard interrupt is requested.
0 Keyboard interrupt request not enabled.
1 Keyboard interrupt request enabled.
0
KBMOD
Keyboard Detection Mode — KBMOD (along with the KBEDG bits) controls the detection mode of the
keyboard interrupt pins.
0 Keyboard detects edges only.
1 Keyboard detects both edges and levels.
9.5.2 KBI pin enable register (KBIPE)
KBIPE contains the pin enable control bits.
Table 70. KBI pin enable register (address $000D)
Bit
7
6
5
4
3
2
1
0
R
W
KBIPE3
KBIPE2
KBIPE1
KBIPE0
Reset
0
0
0
0
0
0
0
0
= Reserved
Table 71. KBIPE register field descriptions
Field
Description
3:0
KBIPEn
Keyboard Pin Enables — Each of the KBIPEn bits enable the corresponding keyboard interrupt pin.
0 Pin not enabled as keyboard interrupt.
1 Pin enabled as keyboard interrupt.
9.5.3 KBI edge select register (KBIES)
KBIES contains the edge select control bits.
Table 72. KBI edge select register (address $000E)
Bit
7
6
5
4
3
2
1
0
R
W
KBEDG3
KBEDG2
KBEDG1
KBEDG0
Reset
0
0
0
0
0
0
0
0
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