MC68HC908AP8CB Freescale Semiconductor, MC68HC908AP8CB Datasheet - Page 270
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
PTD[7:0] — Port D Data Bits
KBI7–KBI0 — Keyboard Interrupt Inputs
16.5.2 Data Direction Register D (DDRD)
Data direction register D determines whether each port D pin is an input or an output. Writing a logic 1 to
a DDRD bit enables the output buffer for the corresponding port D pin; a logic 0 disables the output buffer.
DDRD[7:0] — Data Direction Register D Bits
Figure 16-14
When bit DDRDx is a logic 1, reading address $0003 reads the PTDx data latch. When bit DDRDx is a
logic 0, reading address $0003 reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit.
268
These read/write bits are software programmable. Data direction of each port D pin is under the control
of the corresponding bit in data direction register D. Reset has no effect on port D data.
The keyboard interrupt enable bits, KBIE[7:0], in the keyboard interrupt enable register (KBIER),
enable the port D pins as external interrupt pins. See
These read/write bits control port D data direction. Reset clears DDRD[7:0], configuring all port D pins
as inputs.
1 = Corresponding port D pin configured as output
0 = Corresponding port D pin configured as input
shows the port D I/O logic.
Address:
Avoid glitches on port D pins by writing to the port D data register before
changing data direction register D bits from 0 to 1.
Reset:
Read:
Write:
READ DDRD ($0007)
WRITE DDRD ($0007)
WRITE PTD ($0003)
READ PTD ($0003)
DDRD7
$0007
Bit 7
0
Figure 16-13. Data Direction Register D (DDRD)
DDRD6
6
0
MC68HC908AP Family Data Sheet, Rev. 4
RESET
Figure 16-14. Port D I/O Circuit
DDRD5
5
0
NOTE
DDRD4
DDRDx
PTDx
4
0
Chapter 18 Keyboard Interrupt Module
DDRD3
3
0
# PTD7–PTD0 have schmitt trigger inputs.
DDRD2
2
0
KBIEx
DDRD1
1
0
Freescale Semiconductor
DDRD0
PTDx
Bit 0
0
#
(KBI).
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