MC68HC908GR16CFJ Freescale Semiconductor, MC68HC908GR16CFJ Datasheet - Page 107

• Manufacturer Part Number: MC68HC908GR16CFJ
• Description: IC MCU 16K FLASH 8MHZ SPI 32LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908GR16CFJ

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: LIN, SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

If the MODEK bit is set, the keyboard interrupt pins are both falling edge- and low-level sensitive, and both
of the following actions must occur to clear a keyboard interrupt request:
Freescale Semiconductor
TO PULLUP ENABLE
TO PULLUP ENABLE
$001A
$001B
Addr.
•
•
Vector fetch or software clear — A vector fetch generates an interrupt acknowledge signal to clear
the interrupt request. Software may generate the interrupt acknowledge signal by writing a 1 to the
ACKK bit in the keyboard status and control register (INTKBSCR). The ACKK bit is useful in
applications that poll the keyboard interrupt pins and require software to clear the keyboard
interrupt request. Writing to the ACKK bit prior to leaving an interrupt service routine can also
prevent spurious interrupts due to noise. Setting ACKK does not affect subsequent transitions on
the keyboard interrupt pins. A falling edge that occurs after writing to the ACKK bit latches another
interrupt request. If the keyboard interrupt mask bit, IMASKK, is clear, the CPU loads the program
counter with the vector address at locations $FFE0 and $FFE1.
Return of all enabled keyboard interrupt pins to 1 — As long as any enabled keyboard interrupt pin
is at 0, the keyboard interrupt remains set.
KBD0
KBD7
Keyboard Interrupt Enable
Register Name
and Control Register
VECTOR FETCH
Keyboard Status
KB0IE
KB7IE
INTERNAL BUS
See page 109.
See page 110.
DECODER
(INTKBSCR)
(INTKBIER)
Register
.
.
.
Reset:
Reset:
Figure 9-2. Keyboard Module Block Diagram
Read:
Read:
Write:
Write:
RESET
ACKK
Figure 9-3. I/O Register Summary
KBIE7
MC68HC908GR16 Data Sheet, Rev. 5.0
Bit 7
0
0
0
MODEK
= Unimplemented
KBIE6
V
6
0
0
0
DD
D
CK
CLR
KBIE5
5
0
0
0
Q
KBIE4
4
0
0
0
IMASKK
KBIE3
KEYF
SYNCHRONIZER
3
0
0
ACKK
KBIE2
2
0
0
0
KEYF
Functional Description
IMASKK
KBIE1
1
0
0
KEYBOARD
INTERRUPT
REQUEST
MODEK
KBIE0
Bit 0
0
0
107