MC68HC908AP8CB Freescale Semiconductor, MC68HC908AP8CB Datasheet - Page 264
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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Input/Output (I/O) Ports
DDRA[7:0] — Data Direction Register A Bits
Figure 16-4
When DDRAx is a logic 1, reading address $0000 reads the PTAx data latch. When DDRAx is a logic 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.
Table 16-2
262
These read/write bits control port A data direction. Reset clears DDRA[7:0], configuring all port A pins
as inputs.
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
summarizes the operation of the port A pins.
shows the port A I/O logic.
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
DDRA
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.
Bit
0
1
READ DDRA ($0004)
WRITE DDRA ($0004)
WRITE PTA ($0000)
READ PTA ($0000)
PTA Bit
X
X
(1)
I/O Pin Mode
Input, Hi-Z
MC68HC908AP Family Data Sheet, Rev. 4
Table 16-2. Port A Pin Functions
RESET
Figure 16-4. Port A I/O Circuit
Output
(2)
Accesses to DDRA
NOTE
DDRAx
PTAx
Read/Write
DDRA[7:0]
DDRA[7:0]
PTA[7:0]
Read
Pin
Accesses to PTA
PTA[7:0]
PTA[7:0]
Write
Freescale Semiconductor
PTAx
(3)
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