MCR908JL3ECFAE Freescale Semiconductor, MCR908JL3ECFAE Datasheet - Page 106
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MCR908JL3ECFAE
Manufacturer Part Number
MCR908JL3ECFAE
Description
IC MCU 4K FLASH 8MHZ 48-LQFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908JK1ECDWE.pdf
(180 pages)
Specifications of MCR908JL3ECFAE
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Peripherals
LED, LVD, POR, PWM
Number Of I /o
23
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
48-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Connectivity
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCR908JL3ECFAE
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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Input/Output (I/O) Ports
10.2.2 Data Direction Register A (DDRA)
Data direction register A determines whether each port A pin is an input or an output. Writing a one to a
DDRA bit enables the output buffer for the corresponding port A pin; a zero disables the output buffer.
DDRA[6:0] — Data Direction Register A Bits
Figure 10-4
When DDRAx is a 1, reading address $0000 reads the PTAx data latch. When 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.
106
These read/write bits control port A data direction. Reset clears DDRA[6:0], configuring all port A pins
as inputs.
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
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.
Reset:
Read:
Write:
READ DDRA ($0004)
WRITE DDRA ($0004)
WRITE PTA ($0000)
READ PTA ($0000)
$0004
Bit 7
0
0
Figure 10-3. Data Direction Register A (DDRA)
RESET
= Unimplemented
DDRA6
MC68HC908JL3E Family Data Sheet, Rev. 4
6
0
Figure 10-4. Port A I/O Circuit
DDRA5
5
0
DDRAx
PTAx
NOTE
DDRA4
4
0
DDRA3
3
0
PTAPUEx
DDRA2
2
0
DDRA1
To Keyboard Interrupt Circuit
30k
1
0
PTAx
Freescale Semiconductor
DDRA0
Bit 0
0
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