MC68HC908GT16CFB Freescale Semiconductor, MC68HC908GT16CFB Datasheet - Page 126
MC68HC908GT16CFB
Manufacturer Part Number
MC68HC908GT16CFB
Description
IC MCU 16K FLASH 8MHZ SPI 44PQFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908GT8CFBE.pdf
(292 pages)
Specifications of MC68HC908GT16CFB
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
36
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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Input/Output (I/O) Ports (PORTS)
12.2 Port A
Port A is an 8-bit special-function port that shares all eight of its pins with the keyboard interrupt (KBI)
module. Port A also has software configurable pullup devices if configured as an input port.
12.2.1 Port A Data Register
The port A data register (PTA) contains a data latch for each of the eight port A pins.
PTA7–PTA0 — Port A Data Bits
KBD7–KBD0 — Keyboard Inputs
12.2.2 Data Direction Register A
Data direction register A (DDRA) determines whether each port A pin is an input or an output. Writing a 1
to a DDRA bit enables the output buffer for the corresponding port A pin; a 0 disables the output buffer.
DDRA7–DDRA0 — Data Direction Register A Bits
126
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.
The keyboard interrupt enable bits, KBIE7–KBIE0, in the keyboard interrupt control register (KBICR)
enable the port A pins as external interrupt pins. See
These read/write bits control port A data direction. Reset clears DDRA7–DDRA0, configuring all port
A pins as inputs.
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
Alternative
Function:
Address:
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:
Reset:
Read:
Read:
Write:
Write:
MC68HC908GT16 • MC68HC908GT8 • MC68HC08GT16 Data Sheet, Rev. 5.0
DDRA7
$0000
$0004
KBD7
PTA7
Bit 7
Bit 7
0
Figure 12-3. Data Direction Register A (DDRA)
Figure 12-2. Port A Data Register (PTA)
DDRA6
PTA6
KBD6
6
6
0
DDRA5
PTA5
KBD5
5
5
0
NOTE
DDRA4
Unaffected by reset
PTA4
KBD4
4
4
0
Chapter 9 Keyboard Interrupt Module (KBI).
DDRA3
KBD3
PTA3
3
3
0
DDRA2
KBD2
PTA2
2
2
0
DDRA1
KBD1
PTA1
1
1
0
Freescale Semiconductor
DDRA0
KBD0
PTA0
Bit 0
Bit 0
0
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