NXP Semiconductors
UM11227
NTM88 family of tire pressure monitor sensors
UM11227 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved.
User manual Rev. 6 — 24 April 2020
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Table 37. KBISC register field descriptions
Field Description
3
KBF
KBF - The read-only KBF bit indicates when a keyboard interrupt is detected. Writes have no effect on KBF.
0 = No keyboard interrupt detected; Result of power-on reset. Existing state will remain after all other types
of reset.
1 = Keyboard interrupt detected.
2
KBACK
KBACK - The write-only KBACK bit is part of the flag clearing mechanism. KBACK always reads as 0.
0 = Read result; Write no effect; Result of Reset
1 = Write 1 to clear KBF for Keyboard interrupt acknowledge.
1
KBIE
KBIE - Keyboard Interrupt Enable — KBIE determines whether a keyboard interrupt is requested.
0 = Keyboard interrupt request not enabled; Result of Reset
1 = Keyboard interrupt request enabled.
0
KBIMOD
KBIMOD - Keyboard Detection Mode — KBMOD (along with the KBEDG bits) controls the detection mode
of the keyboard interrupt pins.
0 = Keyboard detects edges only; Result of Reset
1 = Keyboard detects both edges and levels.
10.12.2.2 Keyboard interrupt pin enable register (KBIPE)
Table 38. Keyboard interrupt pin enable register (KBIPE) (address $000D)
Bit 7 6 5 4 3 2 1 0
R 0 0 0 0
W — — — —
KBIPE3 KBIPE2 KBIPE1 KBIPE0
Reset ($00) 0 0 0 0 0 0 0 0
Table 39. KBIPE register field descriptions
Field Description
3:0
KBIPE[3:0]
KBIPE[3:0] – The 4 bits KBIPE[3:0] selects corresponding keyboard interrupt pin from Port A GPIOs.
0 = Pin not enabled as keyboard interrupt; Result of Reset
1 = Pin enabled as keyboard interrupt.
10.12.2.3 Keyboard interrupt edge select register (KBIES)
Table 40. Keyboard interrupt edge select register (KBIES) (address $000E)
Bit 7 6 5 4 3 2 1 0
R 0 0 0 0
W — — — —
KBEDG3 KBEDG2 KBEDG1 KBEDG0
Reset ($00) 0 0 0 0 0 0 0 0
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