MC68HC908LB8CPE Freescale Semiconductor, MC68HC908LB8CPE Datasheet - Page 135
MC68HC908LB8CPE
Manufacturer Part Number
MC68HC908LB8CPE
Description
IC MCU 8K FLASH 8MHZ 20DIP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC68HC908LB8CDWE.pdf
(234 pages)
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
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68HC908LB8CPE
Manufacturer:
IR
Quantity:
10
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DDRA6–DDRA0 — Data Direction Register A Bits
Figure 14-4
When bit DDRAx is a 1, reading address $0000 reads the PTAx data latch. When bit DDRAx is a 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.
Freescale Semiconductor
PTAPUE
These read/write bits control port A data direction. Reset clears DDRA6–DDRA0, configuring all port
A pins as inputs.
Bit
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
X
1
0
shows the port A I/O logic.
Address:
Avoid glitches on port A pins by writing to the port A data register before
changing data direction register A bits from 0 to 1.
DDRA
Reset:
Read:
Write:
Bit
0
0
1
PTAPUEx
READ DDRA ($0004)
WRITE DDRA ($0004)
WRITE PTA ($0000)
READ PTA ($0000)
$0004
Bit 7
0
0
PTA
X
Bit
X
X
(1)
Figure 14-3. Data Direction Register A (DDRA)
DDRA6
6
0
Input, Hi-Z
Input, V
Table 14-1. Port A Pin Functions
RESET
Figure 14-4. Port A I/O Circuit
I/O Pin
Output
MC68HC908LB8 Data Sheet, Rev. 1
Mode
V
DD
INTERNAL
PULLUP
DEVICE
DDRA5
DD
5
0
(2)
(4)
Table 14-1
NOTE
DDRA4
DDRAx
PTAx
4
0
DDRA6–DDRA0
DDRA6–DDRA0
DDRA6–DDRA0
Read/Write
Accesses
to DDRA
summarizes the operation of the port A pins.
DDRA3
3
0
DDRA2
2
0
PTA6–PTA0
Read
Pin
Pin
DDRA1
1
0
Accesses
to PTA
DDRA0
Bit 0
PTAx
0
PTA6–PTA0
PTA6–PTA0
PTA6–PTA0
Write
Port A
(3)
(3)
135
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