MC68HC908GR8CP Freescale Semiconductor, MC68HC908GR8CP Datasheet - Page 214

• Manufacturer Part Number: MC68HC908GR8CP
• Description: IC MCU FLASH 8BIT 8MHZ 4K 28-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908GR8CP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 17
• Program Memory Size: 7.5KB (7.5K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 6x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Input/Output Ports (I/O)
16.4.2 Data Direction Register B
Technical Data
214
NOTE:
NOTE:
Address:
Data direction register B (DDRB) determines whether each port B pin is
an input or an output. Writing a logic 1 to a DDRB bit enables the output
buffer for the corresponding port B pin; a logic 0 disables the output
buffer.
DDRB5–DDRB0 — Data Direction Register B Bits
Avoid glitches on port B pins by writing to the port B data register before
changing data direction register B bits from 0 to 1.
For those devices packaged in a 28-pin DIP and SOIC package, PTB5,4
are not connected. Set DDRB5,4 to a 1 to configure PTB5,4 as outputs.
Figure 16-8
Reset:
Read:
Write:
Freescale Semiconductor, Inc.
These read/write bits control port B data direction. Reset clears
DDRB5–DDRB0], configuring all port B pins as inputs.
For More Information On This Product,
1 = Corresponding port B pin configured as output
0 = Corresponding port B pin configured as input
$0005
Bit 7
0
0
Figure 16-7. Data Direction Register B (DDRB)
shows the port B I/O logic.
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Input/Output Ports (I/O)
6
0
0
DDRB5
5
0
DDRB4
4
0
DDRB3
3
0
MC68HC908GR8 — Rev 4.0
DDRB2
2
0
DDRB1
1
0
MOTOROLA
DDRB0
Bit 0
0