NXP Semiconductors MC9S08LG16, Reference Manual

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Chapter 7 Keyboard Interrupt (S08KBIV2)
MC9S08LG32 MCU Series, Rev. 5
132 Freescale Semiconductor
7.3.2 KBI Pin Enable Register (KBIPE)
KBIPE contains the pin enable control bits.
7.3.3 KBI Edge Select Register (KBIES)
KBIES contains the edge select control bits.
7 6 5 4 3 2 1 0
R 0 0 0 0 KBF 0
KBIE KBMOD
W KBACK
Reset: 0 0 0 0 0 0 0 0
= Unimplemented
Figure 7-3. KBI Status and Control Register
Table 7-3. 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.
7 6 5 4 3 2 1 0
R
KBIPE7 KBIPE6 KBIPE5 KBIPE4 KBIPE3 KBIPE2 KBIPE1 KBIPE0
W
Reset: 0 0 0 0 0 0 0 0
Figure 7-4. KBI Pin Enable Register
Table 7-4. KBIPE Register Field Descriptions
Field Description
7:0
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.