mc9s08qg8 Freescale Semiconductor, Inc, mc9s08qg8 Datasheet - Page 177

• Manufacturer Part Number: mc9s08qg8
• Description: Hcs08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

12.3
The KBI includes three registers:
Refer to the direct-page register summary in the
all KBI registers. This section refers to registers and control bits only by their names and relative address
offsets.
Some MCUs may have more than one KBI, so register names include placeholder characters to identify
which KBI is being referenced.
12.3.1
KBISC contains the status flag and control bits, which are used to configure the KBI.
12.3.2
KBIPE contains the pin enable control bits.
Freescale Semiconductor
KBMOD
KBACK
Field
KBIE
KBF
•
•
•
7:4
3
2
1
0
An 8-bit pin status and control register.
An 8-bit pin enable register.
An 8-bit edge select register.
Reset:
Register Definition
Unused register bits, always read 0.
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.
Keyboard Acknowledge — Writing a 1 to KBACK is part of the flag clearing mechanism. KBACK always reads
as 0.
Keyboard Interrupt Enable — KBIE determines whether a keyboard interrupt is requested.
0 Keyboard interrupt request not enabled.
1 Keyboard interrupt request enabled.
Keyboard Detection Mode — KBMOD (along with the KBEDG bits) controls the detection mode of the keyboard
interrupt pins.0Keyboard detects edges only.
1 Keyboard detects both edges and levels.
KBI Status and Control Register (
W
KBI Pin Enable Register (KBIPE)
R
0
0
7
= Unimplemented
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 1.01
0
0
6
Table 12-2. KBISC Register Field Descriptions
Figure 12-3. KBI Status and Control Register
5
0
0
Memory
0
0
4
Description
chapter for the absolute address assignments for
KBI
KBF
0
3
SC)
KBACK
0
0
2
Keyboard Interrupt (S08KBIV2)
KBIE
0
1
KBMOD
0
0
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