MC68HC908JB12JDW Freescale Semiconductor, MC68HC908JB12JDW Datasheet - Page 293
MC68HC908JB12JDW
Manufacturer Part Number
MC68HC908JB12JDW
Description
IC MCU 12K FLASH 6MHZ USB 20SOIC
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheets
1.MC908JB16DWE.pdf
(332 pages)
2.MC908JB12JDWE.pdf
(12 pages)
3.MC908JB12JDWE.pdf
(2 pages)
Specifications of MC68HC908JB12JDW
Core Processor
HC08
Core Size
8-Bit
Speed
6MHz
Connectivity
SCI, USB
Peripherals
LED, LVD, POR, PWM
Number Of I /o
13
Program Memory Size
12KB (12K x 8)
Program Memory Type
FLASH
Ram Size
384 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
20-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Available stocks
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Part Number:
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16.6 Keyboard Initialization
16.7 I/O Registers
MC68HC908JB16
Freescale Semiconductor
—
Rev. 1.1
When a keyboard interrupt pin is enabled, it takes time for the pullup
device to reach a logic 1. Therefore, a false interrupt can occur as soon
as the pin is enabled.
To prevent a false interrupt on keyboard initialization:
An interrupt signal on an edge-triggered pin can be acknowledged
immediately after enabling the pin. An interrupt signal on an edge- and
level-triggered interrupt pin must be acknowledged after a delay that
depends on the external load.
Another way to avoid a false interrupt:
These registers control and monitor operation of the keyboard module:
1. Mask keyboard interrupts by setting the IMASKK bit in the
2. Enable the KBI pins by setting the appropriate KBIEx bits in the
3. Write to the ACKK bit in the keyboard status and control register
4. Clear the IMASKK bit.
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
•
•
keyboard status and control register.
keyboard interrupt enable register.
to clear any false interrupts.
DDRA bits in data direction register A.
keyboard interrupt enable register.
Keyboard status and control register (KBSCR)
Keyboard interrupt enable register (KBIER)
Keyboard Interrupt Module (KBI)
Keyboard Interrupt Module (KBI)
Technical Data
293
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