MC68HC908JB16DW Freescale Semiconductor, MC68HC908JB16DW Datasheet - Page 273

• Manufacturer Part Number: MC68HC908JB16DW
• Description: IC MCU 16K FLASH 6MHZ USB 28SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908JB16DW

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 6MHz
• Connectivity: SCI, USB
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 21
• Program Memory Size: 16KB (16K 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: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

14.5.2 Data Direction Register D
MC68HC908JB16
Freescale Semiconductor
NOTE:
NOTE:
—
Rev. 1.1
Address:
Data direction register D determines whether each port D pin is an input
or an output. Writing a logic 1 to a DDRD bit enables the output buffer for
the corresponding port D pin; a logic 0 disables the output buffer.
DDRD[5:0] — Data Direction Register D Bits
Avoid glitches on port D pins by writing to the port D data register before
changing data direction register D bits from 0 to 1.
For those devices packaged in a 32-pin low-profile quad flat pack,
PTD5–1 are not connected. DDRD5–1 should be set to a 1 to configure
PTD5–1 as outputs.
Figure 14-10
Reset:
Read:
Write:
These read/write bits control port D data direction. Reset clears
DDRD[5:0], configuring all port D pins as inputs.
Port D pins are open-drain when configured as output.
1 = Corresponding port D pin configured as output
0 = Corresponding port D pin configured as input
$0007
Bit 7
0
0
Figure 14-9. Data Direction Register D (DDRD)
shows the port D I/O circuit logic.
Input/Output (I/O) Ports
6
0
0
DDRD5
5
0
DDRD4
4
0
DDRD3
3
0
DDRD2
2
0
Input/Output (I/O) Ports
DDRD1
1
0
Technical Data
DDRD0
Bit 0
0
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