MC68HC908JK3CP Freescale Semiconductor, MC68HC908JK3CP Datasheet - Page 171

• Manufacturer Part Number: MC68HC908JK3CP
• Description: IC MCU 8MHZ 4K FLASH 20-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908JK3CP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 15
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 12x8b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Connectivity: -

14.4.2 Keyboard Status and Control Register
MC68H(R)C908JL3
Freescale Semiconductor
—
Rev. 1.1
Address:
level-triggered interrupt pin must be acknowledged after a delay that
depends on the external load.
Another way to avoid a false interrupt:
Bits 7–4 — Not used
KEYF — Keyboard Flag Bit
Reset:
Read:
Write:
1. Configure the keyboard pins as outputs by setting the appropriate
2. Write logic 1s to the appropriate port A data register bits.
3. Enable the KBI pins by setting the appropriate KBIEx bits in the
Figure 14-3. Keyboard Status and Control Register (KBSCR)
•
•
•
•
These read-only bits always read as logic 0s.
This read-only bit is set when a keyboard interrupt is pending on port-
A. Reset clears the KEYF bit.
1 = Keyboard interrupt pending
0 = No keyboard interrupt pending
DDRA bits in the data direction register A.
keyboard interrupt enable register.
Flags keyboard interrupt requests.
Acknowledges keyboard interrupt requests.
Masks keyboard interrupt requests.
Controls keyboard interrupt triggering sensitivity.
$001A
Bit 7
0
0
Keyboard Interrupt Module (KBI)
= Unimplemented
6
0
0
5
0
0
4
0
0
KEYF
3
0
Keyboard Interrupt Module (KBI)
ACKK
2
0
0
IMASKK
1
0
Technical Data
MODEK
Bit 0
0
169