MCHC908JK3CPE Freescale Semiconductor, MCHC908JK3CPE Datasheet - Page 171
MCHC908JK3CPE
Manufacturer Part Number
MCHC908JK3CPE
Description
IC MCU 4K FLASH 20-PDIP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC68HC908JK1CDW.pdf
(212 pages)
Specifications of MCHC908JK3CPE
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
Lead free / RoHS Compliant
Eeprom Size
-
Connectivity
-
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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
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