MC68HC908AP8CB Freescale Semiconductor, MC68HC908AP8CB Datasheet - Page 263
MC68HC908AP8CB
Manufacturer Part Number
MC68HC908AP8CB
Description
IC MCU 8K FLASH 8MHZ 42SDIP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908AP8CFBE.pdf
(324 pages)
Specifications of MC68HC908AP8CB
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, IRSCI, SCI, SPI
Peripherals
LED, LVD, POR, PWM
Number Of I /o
32
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
42-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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16.2 Port A
Port A is an 8-bit special-function port that shares all of its pins with the analog-to-digital converter (ADC)
module. Port A pins also have LED direct drive capability.
16.2.1 Port A Data Register (PTA)
The port A data register contains a data latch for each of the eight port A pins.
PTA[7:0] — Port A Data Bits
ADC7–ADC0 — ADC Channels 7 to 0
LED drive — Direct LED drive pins
16.2.2 Data Direction Register (DDRA)
Data direction register A determines whether each port A pin is an input or an output. Writing a logic 1 to
a DDRA bit enables the output buffer for the corresponding port A pin; a logic 0 disables the output buffer.
Freescale Semiconductor
These read/write bits are software-programmable. Data direction of each port A pin is under the control
of the corresponding bit in data direction register A. Reset has no effect on port A data.
ADC7–ADC0 are pins used for the input channels to the analog-to-digital converter module. The
channel select bits, ADCH[4:0], in the ADC status and control register define which port pin will be used
as an ADC input and overrides any control from the port I/O logic.
PTA7–PTA0 pins can be configured for direct LED drive. See
(LEDA).
Alternative Function:
Additional Function: LED drive
Address:
Care must be taken when reading port A while applying analog voltages to
ADC7–ADC0 pins. If the appropriate ADC channel is not enabled,
excessive current drain may occur if analog voltages are applied to the
PTAx/ADCx pin, while PTA is read as a digital input. Those ports not
selected as analog input channels are considered digital I/O ports.
Reset:
Read:
Write:
Address:
Reset:
Read:
Write:
DDRA7
$0004
Bit 7
0
Figure 16-3. Data Direction Register A (DDRA)
$0000
ADC7
PTA7
Bit 7
Figure 16-2. Port A Data Register (PTA)
DDRA6
6
0
MC68HC908AP Family Data Sheet, Rev. 4
LED drive
ADC6
PTA6
6
DDRA5
5
0
LED drive
ADC5
PTA5
5
NOTE
DDRA4
4
0
LED drive
Unaffected by reset
ADC4
PTA4
4
DDRA3
3
0
LED drive
ADC3
PTA3
3
16.2.3 Port-A LED Control Register
DDRA2
2
0
LED drive
ADC2
PTA2
2
DDRA1
1
0
LED drive
ADC1
PTA1
1
DDRA0
Bit 0
0
LED drive
ADC0
PTA0
Bit 0
Port A
261
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