mc9rs08ka2 Freescale Semiconductor, Inc, mc9rs08ka2 Datasheet - Page 52

• Manufacturer Part Number: mc9rs08ka2
• Description: Rs08 Microcontrollers 8-bit Microcontroller Family
• Manufacturer: Freescale Semiconductor, Inc

Chapter 7 Keyboard Interrupt (RS08KBIV1)
7.1.2
This section defines the KBI operation in wait, stop, and background debug modes.
7.1.2.1
The KBI continues to operate in wait mode if enabled before executing the WAIT instruction. Therefore,
an enabled KBI pin (KBPEn = 1) can be used to bring the MCU out of wait mode if the KBI interrupt is
enabled (KBIE = 1).
7.1.2.2
The KBI operates asynchronously in stop mode if enabled before executing the STOP instruction.
Therefore, an enabled KBI pin (KBPEn = 1) can be used to bring the MCU out of stop mode if the KBI
interrupt is enabled (KBIE = 1).
7.1.2.3
When the microcontroller is in active background mode, the KBI will continue to operate normally.
7.1.3
The block diagram for the keyboard interrupt module is shown
7.2
The KBI input pins can be used to detect either falling edges, or both falling edge and low level interrupt
requests. The KBI input pins can also be used to detect either rising edges, or both rising edge and high
level interrupt requests.
The signal properties of KBI are shown in
52
KBIP0
KBIPn
KBEDGn
KBEDG0
External Signal Description
Modes of Operation
Block Diagram
0
1
0
1
S
S
Operation in Wait Mode
Operation in Stop Mode
Operation in Active Background Mode
KBIPE0
KBIPEn
Signal
KBIPn
Figure 7-2. Keyboard Interrupt (KBI) Block Diagram
MC9RS08KA2 Series Data Sheet, Rev. 3
Keyboard interrupt pins
Table 7-1. Signal Properties
Table
KBMOD
V
DD
7-1.
Function
D
CK
CLR
Q
INTERRUPT FF
KEYBOARD
Figure
KBACK
RESET
7-2.
STOP
I/O
I
SYNCHRONIZER
BUSCLK
STOP BYPASS
Freescale Semiconductor
KBIE
KBF
KBI
INTERRUPT
REQUES
T