NXP Semiconductors UM11227 - External Wake-Up Functions; KBI Status and Control Register (KBISC)

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 35. PTBDD register field descriptions
Field Description
1:0
PTBDD[1:0]
PTBDD[1:0] - Each bit selects the direction of port B pins and what is read for PTBDD reads.
Each bit 0 = Input (output driver disabled) and reads return the pin value; Result of Reset
Each bit 1 = Output driver enabled for port B bit n and PTBDD reads return the contents of PTBDDn.
0 0 = Result of Reset
10.12.2 External wake-up functions
10.12.2.1 KBI status and control register (KBISC)
Note:
Prior to enabling the keyboard by setting the KBIE to 1, this status byte, as a first step,
must be read to avoid an immediate assertion of the interrupt.
In addition, the keyboard interrupt KBF results immediately:
•
if a port pin PTA[3:0] is at a logic 1 state and
•
the user subsequently enables the keyboard by setting the corresponding KBIE[3:0] to
1 and
•
the user sets the edge to rising/high by setting to 1 the corresponding KBIES[3:0]
QD
CK
CLR
SYNCHRONIZER
STOP BYPASS
STOP
KBACK
RESET KBF
KBF
aaa-02
8003
KBMOD
VDD
BUSCLK
KBIPE0
1
0
S
KBEDG0
KBIPEn
1
0
S
KBEDGn
Figure 15. KBI block diagram
Table 36. KBI status and control register (KBISC) (address $000C)
Bit 7 6 5 4 3 2 1 0
R 0 0 0 0 KBF 0
W — — — — — KBACK
KBIE KBIMOD
Reset 0 0 0 0 0 0 0 0
POR ($00) 0 0 0 0 0 0 0 0