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HCS08 Scheda tecnica(PDF) 151 Page - Motorola, Inc

Il numero della parte HCS08
Spiegazioni elettronici  Microcontrollers
PDF  290 Pages
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Produttore elettronici  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

HCS08 Scheda tecnica(HTML) 151 Page - Motorola, Inc

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Data Sheet — MC9S08GB60/D V1.5
MOTOROLA
151
MC9S08GB/GT
9.3 KBI Block Diagram
Figure 9-3 shows the block diagram for a KBI module.
Figure 9-3 KBI Block Diagram
The KBI module allows up to eight pins to act as additional interrupt sources. Four of these pins allow
falling-edge sensing while the other four can be configured for either rising-edge sensing or falling-edge
sensing. The sensing mode for all eight pins can also be modified to detect edges and levels instead of just
edges.
9.4 Keyboard Interrupt (KBI) Module
This on-chip peripheral module is called a keyboard interrupt (KBI) module because originally it was
designed to simplify the connection and use of row-column matrices of keyboard switches. However,
these inputs are also useful as extra external interrupt inputs and as an external means of waking up the
MCU from stop or wait low-power modes.
9.4.1 Pin Enables
The KBIPEn control bits in the KBIPE register allow a user to enable (KBIPEn = 1) any combination of
KBI-related port pins to be connected to the KBI module. Pins corresponding to 0s in KBIPE are
general-purpose I/O pins that are not associated with the KBI module.
9.4.2 Edge and Level Sensitivity
Synchronous logic is used to detect edges. Prior to detecting an edge, enabled keyboard inputs in a KBI
module must be at the deasserted logic level.
KEYBOARD
INTERRUPT
DQ
CK
CLR
VDD
KBIMOD
KBIE
KEYBOARD
INTERRUPT FF
REQUEST
KBACK
RESET
SYNCHRONIZER
KBF
STOP BYPASS
STOP
BUSCLK
KBIPEn
0
1
S
KBEDGn
KBIPE0
KBIPE3
KBIPE4
0
1
S
KBEDG4
KBIP0
KBIP3
KBIP4
KBIPn



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