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Keyboard Interrupts (S08KBIV2)

MC9S08JM60 Series Data Sheet, Rev. 5

Freescale Semiconductor

127

9.1.1

Features

The KBI features include:

•

Up to eight keyboard interrupt pins with individual pin enable bits.

•

Each keyboard interrupt pin is programmable as falling edge (or rising edge) only, or both falling

edge and low level (or both rising edge and high level) interrupt sensitivity.

•

One software enabled keyboard interrupt.

•

Exit from low-power modes.

9.1.2

Modes of Operation

This section defines the KBI operation in wait, stop, and background debug modes.

9.1.2.1

KBI in Wait Mode

The KBI continues to operate in wait mode if enabled before executing the WAIT instruction. Therefore,

an enabled KBI pin (KBPEx = 1) can be used to bring the MCU out of wait mode if the KBI interrupt is

enabled (KBIE = 1).

9.1.2.2

KBI in Stop Modes

The KBI operates asynchronously in stop3 mode if enabled before executing the STOP instruction.

Therefore, an enabled KBI pin (KBPEx = 1) can be used to bring the MCU out of stop3 mode if the KBI

interrupt is enabled (KBIE = 1).

During either stop1 or stop2 mode, the KBI is disabled. In some systems, the pins associated with the KBI

may be sources of wakeup from stop1 or stop2, see the stop modes section in the Modes of Operation

chapter. Upon wake-up from stop1 or stop2 mode, the KBI module will be in the reset state.

9.1.2.3

KBI in Active Background Mode

When the microcontroller is in active background mode, the KBI will continue to operate normally.

9.1.3

Block Diagram

The block diagram for the keyboard interrupt module is shown Figure 9-2.

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