MC68HC908JK8CP Freescale Semiconductor, MC68HC908JK8CP Datasheet - Page 170

• Manufacturer Part Number: MC68HC908JK8CP
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908JK8CP

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 8MHz
• Interface Type: SCI
• Program Memory Type: Flash
• Program Memory Size: 8KB
• Total Internal Ram Size: 256Byte
• # I/os (max): 15
• Number Of Timers - General Purpose: 4
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 13-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 20
• Package Type: PDIP
• Lead Free Status / Rohs Status: Not Compliant

Keyboard Interrupt Module (KBI)
KEYF — Keyboard Flag Bit
ACKK — Keyboard Acknowledge Bit
IMASKK— Keyboard Interrupt Mask Bit
MODEK — Keyboard Triggering Sensitivity Bit
13.5.2 Keyboard Interrupt Enable Register
The port-A keyboard interrupt enable register enables or disables each port-A pin to operate as a
keyboard interrupt pin
KBIE7–KBIE0 — Port-A Keyboard Interrupt Enable Bits
170
This read-only bit is set when a keyboard interrupt is pending on port A. Reset clears the KEYF bit.
Writing a logic 1 to this write-only bit clears the keyboard interrupt request on port A. ACKK always
reads as logic 0. Reset clears ACKK.
Writing a logic 1 to this read/write bit prevents the output of the keyboard interrupt mask from
generating interrupt requests on port A. Reset clears the IMASKK bit.
This read/write bit controls the triggering sensitivity of the keyboard interrupt pins on port A. Reset
clears MODEK.
Each of these read/write bits enables the corresponding keyboard interrupt pin on port-A to latch
interrupt requests. Reset clears the keyboard interrupt enable register.
1 = Keyboard interrupt pending
0 = No keyboard interrupt pending
1 = Keyboard interrupt requests masked
0 = Keyboard interrupt requests not masked
1 = Keyboard interrupt requests on falling edges and low levels
0 = Keyboard interrupt requests on falling edges only
1 = KBIx pin enabled as keyboard interrupt pin
0 = KBIx pin not enabled as keyboard interrupt pin
Address: $001A
Address:
Reset:
Reset:
Read:
Read:
Write:
Write:
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
Figure 13-3. Keyboard Status and Control Register (KBSCR)
Figure 13-4. Keyboard Interrupt Enable Register (KBIER)
$001B
KBIE7
Bit 7
Bit 7
0
0
0
= Unimplemented
KBIE6
6
0
0
6
0
KBIE5
5
0
0
5
0
KBIE4
4
0
0
4
0
KBIE3
KEYF
3
0
3
0
KBIE2
ACKK
2
0
0
2
0
IMASKK
KBIE1
1
0
1
0
Freescale Semiconductor
MODEK
KBIE0
Bit 0
Bit 0
0
0