MC9S08GT16CFB Freescale Semiconductor, MC9S08GT16CFB Datasheet - Page 149
MC9S08GT16CFB
Manufacturer Part Number
MC9S08GT16CFB
Description
Manufacturer
Freescale Semiconductor
Datasheet
1.MC9S08GT16CFB.pdf
(290 pages)
Specifications of MC9S08GT16CFB
Cpu Family
HCS08
Device Core Size
8b
Frequency (max)
20MHz
Interface Type
SCI/SPI
Program Memory Type
Flash
Program Memory Size
16KB
Total Internal Ram Size
1KB
# I/os (max)
36
Number Of Timers - General Purpose
4
Operating Supply Voltage (typ)
2.5/3.3V
Operating Supply Voltage (max)
3.6V
Operating Supply Voltage (min)
2.08V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
44
Package Type
PQFP
Lead Free Status / Rohs Status
Not Compliant
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KBEDGn — Keyboard Edge Select for KBI Port Bit n (n = 7–4)
KBF — Keyboard Interrupt Flag
KBACK — Keyboard Interrupt Acknowledge
KBIE — Keyboard Interrupt Enable
KBIMOD — Keyboard Detection Mode
Freescale Semiconductor
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 configured 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.
This read-only status flag is set whenever the selected edge event has been detected on any of the
enabled KBI port pins. This flag is cleared by writing a 1 to the KBACK control bit. The flag will
remain set if KBIMOD = 1 to select edge-and-level operation and any enabled KBI port pin remains
at the asserted level.
KBF can be used as a software pollable flag (KBIE = 0) or it can generate a hardware interrupt request
to the CPU (KBIE = 1).
This write-only bit (reads always return 0) is used to clear the KBF status flag by writing a 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 flag.
This read/write control bit determines whether hardware interrupts are generated when the KBF status
flag equals 1. When KBIE = 0, no hardware interrupts are generated, but KBF can still be used for
software polling.
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 configured to detect either:
•
•
1 = Rising edges/high levels.
0 = Falling edges/low levels.
1 = KBI interrupt pending.
0 = No KBI interrupt pending.
1 = KBI hardware interrupt requested when KBF = 1.
0 = KBF does not generate hardware interrupts (use polling).
1 = Edge-and-level detection.
0 = Edge-only detection.
Rising edges-only or rising edges and high levels (KBEDGn = 1)
Falling edges-only or falling edges and low levels (KBEDGn = 0)
MC9S08GB/GT Data Sheet, Rev. 2.3
KBI Registers and Control Bits
149
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