參數(shù)資料
型號(hào): MC9S08RC8CPE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP28
封裝: ROHS COMPLIANT, PLASTIC, DIP-28
文件頁(yè)數(shù): 32/234頁(yè)
文件大?。?/td> 1758K
代理商: MC9S08RC8CPE
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Keyboard Interrupt (KBI) Block Description
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
Freescale Semiconductor
127
9.4.1
KBI x Status and Control Register (KBIxSC)
76543210
R
KBF
0
KBIE
KBIMOD
W
KBACK
Reset
00000000
= Unimplemented or Reserved
Figure 9-3. KBI x Status and Control Register (KBIxSC)
Table 9-1. KBIxSC Field Descriptions
Field
Description
7:4
KBEDG[7:4]
Keyboard Edge Select for KBI Port Bits — Each of these read/write bits selects the polarity of the edges and/or
levels that are recognized as trigger events on the corresponding KBI port pin when it is congured as a keyboard
interrupt input (KBIPEn = 1). Also see the KBIMOD control bit, which determines whether the pin is sensitive to
edges-only or edges and levels.
0 Falling edges/low levels.
1 Rising edges/high levels.
3
KBF
Keyboard Interrupt Flag — This read-only status ag is set whenever the selected edge event has been
detected on any of the enabled KBI port pins. This ag is cleared by writing a logic 1 to the KBACK control bit.
The ag will remain set if KBIMOD = 1 to select edge-and-level operation and any enabled KBI port pin remains
at the asserted level.
0 No KBI interrupt pending.
1 KBI interrupt pending.
KBF can be used as a software pollable ag (KBIE = 0) or it can generate a hardware interrupt request to the
CPU (KBIE = 1). KBF must be cleared before entering stop mode.
2
KBACK
Keyboard Interrupt Acknowledge — This write-only bit (reads always return 0) is used to clear the KBF status
ag by writing a logic 1 to KBACK. When KBIMOD = 1 to select edge-and-level operation and any enabled KBI
port pin remains at the asserted level, KBF is being continuously set so writing 1 to KBACK does not clear the
KBF ag.
1
KBIE
Keyboard Interrupt Enable — This read/write control bit determines whether hardware interrupts are generated
when the KBF status ag equals 1. When KBIE = 0, no hardware interrupts are generated, but KBF can still be
used for software polling.
0 KBF does not generate hardware interrupts (use polling).
1 KBI hardware interrupt requested when KBF = 1.
0
KBIMOD
Keyboard Detection Mode — This read/write control bit selects either edge-only detection or edge-and-level
detection. KBI port bits 3 through 0 can detect falling edges-only or falling edges and low levels.
KBI port bits 7 through 4 can be congured to detect either:
Rising edges-only or rising edges and high levels (KBEDGn = 1)
Falling edges-only or falling edges and low levels (KBEDGn = 0)
0 Edge-only detection.
1 Edge-and-level detection.
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