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