MC68HC908LB8CPE Freescale Semiconductor, MC68HC908LB8CPE Datasheet - Page 137

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MC68HC908LB8CPE

Manufacturer Part Number
MC68HC908LB8CPE
Description
IC MCU 8K FLASH 8MHZ 20DIP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC68HC908LB8CPE

Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Peripherals
LVR, POR, PWM
Number Of I /o
18
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 7x8b
Oscillator Type
Internal
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
-

Available stocks

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Part Number
Manufacturer
Quantity
Price
Part Number:
MC68HC908LB8CPE
Manufacturer:
IR
Quantity:
10
14.3.2 Data Direction Register B
Data direction register B (DDRB) determines whether each port B pin is an input or an output. Writing a
1 to a DDRB bit enables the output buffer for the corresponding port B pin; a 0 disables the output buffer.
DDRB7–DDRB0 — Data Direction Register B Bits
Figure 14-8
When bit DDRBx is a 1, reading address $0001 reads the PTBx data latch. When bit DDRBx is a 0,
reading address $0001 reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit.
Freescale Semiconductor
These read/write bits control port B data direction. Reset clears DDRB7–DDRB0, configuring all port
B pins as inputs.
1 = Corresponding port B pin configured as output
0 = Corresponding port B pin configured as input
shows the port B I/O logic.
Address:
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.
Reset:
Read:
Write:
READ DDRB ($0005)
WRITE DDRB ($0005)
WRITE PTB ($0001)
READ PTB ($0001)
DDRB7
$0005
Bit 7
0
Figure 14-7. Data Direction Register B (DDRB)
DDRB6
6
0
RESET
Figure 14-8. Port B I/O Circuit
MC68HC908LB8 Data Sheet, Rev. 1
DDRB5
5
0
Table 14-2
NOTE
DDRB4
DDRBx
PTBx
4
0
summarizes the operation of the port B pins.
DDRB3
3
0
DDRB2
2
0
DDRB1
1
0
DDRB0
Bit 0
PTBx
0
Port B
137

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