MC68HC908JK3CP Freescale Semiconductor, MC68HC908JK3CP Datasheet - Page 153

• 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: -

12.4.2 Port A Input Pull-up Enable Register (PTAPUE)
MC68H(R)C908JL3
Freescale Semiconductor
—
Rev. 1.1
When DDRAx is a logic 1, reading address $0000 reads the PTAx data
latch. When DDRAx is a logic 0, reading address $0000 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit.
The Port A Input Pull-up Enable Register (PTAPUE) contains a software
configurable pull-up device for each if the seven port A pins. Each bit is
individually configurable and requires the corresponding data direction
register, DDRAx be configured as input. Each pull-up device is
automatically and dynamically disabled when its corresponding DDRAx
bit is configured as output.
READ DDRA ($0004)
WRITE DDRA ($0004)
WRITE PTA ($0000)
READ PTA ($0000)
Figure 12-4. Port A I/O Circuit
I/O Ports
RESET
DDRAx
PTAx
To Keyboard Interrupt Circuit
PTAPUEx
Technical Data
I/O Ports
30k
PTAx
151